AirToAir

Japan’s Ministry of Defense has included an intriguing description of the ASM-3 Kai missile in its record fiscal year 2027 defense budget request, referring to the weapon as an “air-to-surface/anti-air missile.” Until now, the ASM-3 family has been publicly associated with the air-launched anti-ship (anti-surface) mission, and the wording potentially hints at an additional capability or intended role for the upgraded weapon.

The reference appears in Japan’s FY2027 defense budget request, submitted today, which seeks a record ¥8.89 trillion (approximately $56 billion) for the fiscal year beginning in April 2027. The request is part of a broader push by Tokyo to expand standoff strike, air defense, uncrewed systems, and other advanced capabilities.

The reference appears under a sub-section entitled Durability and Resilience, which calls for funds to “secure ammunition and fuel, increase the number of operational units (by addressing parts shortages, etc.), enhance the resilience of facilities (through facility upgrades associated with the formation of new units and the introduction of new equipment, etc.), and strengthen the operational infrastructure (by enhancing manufacturing capabilities, etc.).”

In terms of securing ammunition, the document highlights the breadth of weapons systems involved, ranging from 5.56mm small arms ammunition and 30mm cannon rounds, via 155mm precision artillery rounds, up to advanced missiles including the Type 23 ship-launched air defense missile and the ASM-3 Kai.

The Mitsubishi Heavy Industries (MHI) ASM-3 is Japan’s domestically developed supersonic air-launched anti-ship missile, originally intended to arm the Mitsubishi F-2 fighter. The improved ASM-3 Kai (“Kai” meaning modified or revised) represents a significant evolution of the weapon, although the full nature of its capabilities and performance have not been officially revealed. The missile has already been observed undergoing testing on F-2s.

The ASM-3 program has also gone through a number of different configurations over its development history, with at least five distinct external configurations identified in previous reporting. The existence of multiple iterations leaves open the possibility that the newly identified “anti-air” designation could ultimately correspond to a dedicated air-to-air variant or derivative of the ASM-3 family, rather than simply a secondary capability of the baseline ASM-3 Kai.

Reportedly, the ASM-3 Kai is capable of flying more than 400 kilometers (about 250 miles), although the exact range of the operational weapon remains classified. It is powered by a ramjet engine, giving it sustained high-speed performance — reportedly around Mach 3. If it indeed has an air-to-air capability, this would be an advantage in some scenarios, compared to relying solely on a brief but very powerful rocket boost as many air-to-air missiles do.

The weapon is also understood to employ an active/passive radar seeker, providing it with both an active radar mode for detecting and engaging targets and a passive mode that can home in on their electromagnetic emissions. While an active radar seeker is common on long-range air-to-air missiles, the latter passive capability could also be of extreme value in an air-to-air application.

The ASM-3 is also a substantially larger missile than typical fighter-launched air-to-air weapons. While that imposes obvious carriage and aerodynamic penalties, it also allows for a larger propulsion system, seeker, and warhead than would be practical in a smaller missile.

A weapon capable of traveling hundreds of miles at high speed, while carrying an active/passive radar seeker, could potentially be especially useful against high-value airborne assets such as airborne early warning and control (AEW&C) aircraft. These platforms provide vital wide-area surveillance, battle management, and targeting capabilities. At the same time, their powerful radars are necessarily emitting, potentially making them detectable and trackable by a missile employing a passive seeker.

China’s rapidly expanding AEW&C fleet is an increasingly important part of its ability to generate situational awareness, coordinate fighters, and extend its sensor coverage well beyond its immediate borders. The force, which already numbers dozens of increasingly capable fixed-wing aircraft, is a growing operational challenge for Japan and other regional air forces.

The ability to threaten such aircraft from well beyond the range of conventional air-to-air engagements could force an opponent to operate its AEW&C fleet even further from contested airspace, reducing the effectiveness of its sensors and command-and-control architecture. Although a passive seeker could also offer an avenue for homing in on relevant radar emissions, exactly how the ASM-3 Kai’s seeker would operate against airborne targets is not publicly known. Equally, a different variant of the missile, optimized for anti-air missions, could incorporate both passive and active seekers specially adapted for that mission set, although it is very possible a single configuration can accomplish both missions. As well as AEW&C aircraft, such a missile would be just as relevant for other high-value, non-maneuvering targets at long ranges, including intelligence-gathering platforms, tankers, and other support aircraft.

The budget language by itself falls short of establishing whether the ASM-3 Kai has been tested or validated against aircraft. The designation could reflect a broader classification within the budget documents, or it could point toward a genuine expansion of the weapon’s intended target set.

XASM-3 Supersonic anti-ship missile test launch

Such a weapon would not necessarily be a replacement for Japan’s existing air-to-air missile arsenal. Instead, an “anti-air” ASM-3 Kai could occupy a specialized niche focused on high-value or otherwise particularly important airborne targets at extended ranges.

The possibility is consistent with Japan’s broader effort to expand the flexibility and reach of its air-launched weapons. Tokyo is pursuing a growing family of standoff weapons as part of a major expansion of its counterstrike and deterrence capabilities, including longer-range missiles capable of striking targets well beyond the immediate vicinity of Japan.

Other air-to-air missiles mentioned in the same section of the document comprise the U.S.-made AIM-120 Advanced Medium-Range Air-to-Air Missile (AMRAAM) and the domestically developed AAM-4B, another medium-range weapon, thought to be the first of its kind to be fitted with an active electronically scanned array (AESA) antenna.

Between the exclusive AESA radar and Japan’s labour cost, Mitsubishi’s AAM-4B might be the most expensive air-to-air missile on the planet pic.twitter.com/rfBnXB8RzS

— Lia Wong (@LiaWong__) May 3, 2022

The FY2027 defense budget request also mentions another apparently new air-launched weapon for Japan, the AGM-88G Advanced Anti-Radiation Guided Missile-Extended Range (AARGM-ER). Japan has not previously been publicly documented as an international AARGM-ER customer, but the weapon would be an obvious candidate for integration with its F-35 fighters if it wishes to bolster their suppression/destruction of enemy air defenses (SEAD/DEAD) capabilities.

In terms of F-2-related developments, the document calls for the upgrade of an initial 10 of these aircraft to make them compatible with the air-launched version of the Upgraded Type 12 anti-ship guided missile, a significant new weapon that you can read more about here.

TWZ has contacted Japan’s Ministry of Defense seeking clarification on the “air-to-surface/anti-air” designation and what it means for the ASM-3 Kai’s intended capabilities and target set. It could also be the case that the description is an error in the budget document.

However, the emergence of such a capability would also come at a time when very-long-range air-to-air weapons are becoming increasingly important as anti-access/area-denial challenges make it harder for fighters to get close to enemy aircraft and the high-value assets supporting them. China has fielded weapons such as the PL-15 and the much larger PL-17, while the United States is developing the AIM-260 and has just revealed the AIM-424 Malice, a U.S. Navy missile reportedly capable of reaching more than 250 nautical miles. The U.S. Navy is also fielding the AIM-174B, a very-long-range weapon developed very much with the Chinese threat in mind, and which we discuss in the video below.

How The Navy’s New Very Long-Range AIM-174 Will Pierce China’s Anti-Access Bubble

For now, exactly what prompted the “air-to-surface/anti-air” designation for the missile is unclear, but if it reflects a genuine expansion of the ASM-3 Kai’s mission set, it would represent a particularly interesting development in Japan’s rapidly evolving air-launched weapons portfolio.

Hat-tip to Yoshihiro Inaba for bringing this development to our attention.

Contact the author: thomas@thewarzone.com

Europe is entering an interesting, and potentially highly consequential, period in the development of beyond-visual-range (BVR) air-to-air weapons. While the public emergence of new U.S. weapons in this class has unsurprisingly grabbed the headlines in recent months, Europe is meanwhile working on several projects that ultimately seek to field its next generation of far-reaching air-to-air missiles.

As in the United States, the immediate catalyst is the rapid evolution of Chinese air-to-air missiles, particularly the PL-15 and newer systems that are emerging around it. The India-Pakistan air combat experience from last year has brought the issue into sharper focus, demonstrating the operational consequences of underestimating an opponent’s long-range air-to-air capabilities. However, while Pakistan said its Chinese-made fighters and missiles shot down several Indian aircraft, the precise circumstances, numbers, and tactics involved remain the subject of competing claims and outside analysis.

For Europe, the MBDA Meteor is currently the state of the art in terms of BVR air-to-air missiles, and its unique set of capabilites is something we have discussed in depth in the past. The question is increasingly not simply how to improve the Meteor, but what should come after it, and what kind of weapons architecture (or ‘kill chain’) will be needed for the next generation of crewed and uncrewed combat aircraft and their weapons.

One of the most intriguing current developments is France’s Comet program, which appears to be led by the French side of the pan-European MBDA consortium. Very little is publicly known about the weapon, and its exact specifications remain unclear. It nevertheless appears to represent an effort to provide a significant step beyond the current MICA family, offering greater range and speed. If the apparent timeline of around 2030 is correct, Comet could be viewed as a relatively near-term response to an increasingly demanding threat environment.

Douglas Barrie, senior fellow for military aerospace at the International Institute for Strategic Studies (IISS) research institute in London, told TWZ that Comet looks like “a response to the exchanges between the Pakistanis and the Indians, where, on day one, the Indians underestimated how aggressive the Pakistanis were going to be, particularly with PL-15. It seems coincidental at the very least that this kind of thing has just popped up onto the horizon.”

That would distinguish Comet from the U.K.’s Future Air Superiority Effectors, or FASE, program which appears to be associated much more closely with the longer-term requirements of the U.K.’s Future Combat Air System and GCAP/Tempest.

Talking to TWZ, Justin Bronk, a research fellow for airpower at the Royal United Services Institute (RUSI), explained that FASE “is likely aimed at providing significantly better combat capabilities by the early-mid 2030s than a mid-life upgrade of the Meteor missile would be able to offer within the bounds of its basic layout and size.”

Creating an interesting overlap with FASE and Comet is a joint Franco-British study looking at what comes after Meteor. In April, the two countries signed a memorandum of understanding launching the 12-month effort that will assess future air-combat threats and potential next-generation missile concepts. The study is intended to identify the technologies required for a successor weapon and establish a development roadmap. While the two countries are at least formally examining the same post-Meteor problem, their longer-term combat air priorities appear to be diverging.

Beyond Meteor

Meteor remains one of Europe’s most capable air-to-air weapons. Its ramjet propulsion system gives it an important advantage over conventional solid-rocket missiles by allowing it to retain propulsion and energy much further into an engagement.

However, the threat environment that Meteor was designed against is changing. Meteor’s requirements were established in an environment dominated by the Soviet/Russian air-to-air missile threat. Today’s planning increasingly has to account for Chinese weapons such as the PL-15 and newer systems that may combine very long range with substantially greater speed.

“Since the Meteor is still more than a match for current Russian air-to-air missiles in air-to-air engagements, it is likely that the capability goals for the FASE program will use far more capable Chinese air-to-air missiles, aircraft, and sensors as pacing threats,” Bronk ​​​​added.

That raises the uncomfortable question of what happens when both sides can launch extremely capable BVR weapons against each other?

Simply put, higher speed now matters more, because it reduces the target’s reaction time and can make the terminal engagement substantially more demanding. One of Meteor’s advantages is the considerable energy it retains when it reaches the terminal phase, but the tradeoff is a slower average speed across the entirety of its flight envelope.

Meteor

Barrie explained: “Meteor’s fly-out speed is somewhere between Mach 3.5 and somewhere below Mach 4. If you launch a PL-15 off a J-20, which is doing Mach 2, that weapon probably stays above Mach 5 for an awfully long time, which is one of the issues. It’s that risk of a mutual kill. Obviously, if the weapon against the J-20 is coming out at Mach 3.5 to Mach 4, then you have a bit an issue there.”

At the same time, a missile’s effectiveness depends on many other factors, including launch conditions, flight profile, midcourse guidance, seeker performance, electronic warfare environment, and target maneuvering.

However, the nature of the threat may push the next generation of European weapons toward a combination of greater range, substantially higher speed and greater terminal energy rather than simply another incremental improvement to Meteor. Indeed, the United Kingdom has dropped its plans for a Meteor mid-life upgrade, presumably to focus its efforts on an altogether more ambitious and capable successor, or successors.

Does the next weapon need a ramjet?

The Meteor was designed around a ramjet motor, especially since it was expected to face a ramjet version of the Russian R-77 (AA-12 Adder) missile. This was never fielded, and, as far as we know, China doesn’t have a weapon in this class either. A Meteor successor therefore won’t necessarily use the same kind of propulsion.

Meteor demonstrated the advantages of air-breathing propulsion, but there are trade-offs involved in using a ramjet or another air-breathing system. Achieving very high speeds while maintaining useful range and maneuverability can become increasingly difficult, and propulsion complexity adds cost and potentially consumes valuable internal volume.

The performance being attributed in open sources to Chinese solid-propellant weapons like the PL-15 suggests that another approach is possible.

Barrie would not be surprised if the ramjet is dropped. “The issue with a ramjet is it’s not impossible to get above Mach 5, but it’s difficult, and there are lots of compromises you probably have to make … I wonder if they may just look at energetic solids.”

A future European missile could therefore use a substantially larger solid-propellant motor, potentially coupled with a different boost and sustain architecture, to achieve the required combination of speed and range. Using more than one stage, or a multi-pulse solid rocket motor could be other solutions to the issue.

The size problem

Perhaps the biggest opportunity for a new European BVR weapon comes from the aircraft that will carry it.

Meteor was developed within the physical constraints imposed by existing fighter aircraft and their weapons-carriage arrangements, including internal carriage in the F-35. A future combat aircraft such as Tempest is expected to have significantly greater internal volume available for weapons.

“One of the drivers for Tempest is internal carriage, obviously, but lots of it,” Barrie continued. “A big main bay, and then probably sizeable side bays as well. That lets you carry a considerably larger weapon mass internally than an F-35. If you look at size of the platform in terms of what they’ve released, it’s a big aircraft, and one would assume it has a very significant internal weapons bay.”

A larger missile can carry more propellant, potentially support a more powerful propulsion system, accommodate a larger or more capable seeker, and provide additional volume for electronics and other subsystems.

As we have explained in the past:

There are different ways of increasing the range of an air-to-air missile, but this process is always easier if the weapon can be made larger. Bigger dimensions can translate to a bigger engine, more fuel, multi-stage rocket motors, and air-breathing engines, like the ramjet used in the Meteor. Other range-extending options that the United States has examined include throttleable “multi-pulse solid rocket motors” and more exotic “propellants, grain configurations, cases, and liners,” all of which would also be able to ensure greater range — as well as higher speed — compared to existing weapons.

The result could be a weapon that is considerably larger than Meteor but still fully compatible with the aircraft for which it was designed.

This realuty, and the use of the plural effectors in the U.K.’s FASE terminology raises the possibility that the future European BVR requirement may not be for one missile, but for a family of weapons — at least as far as the British are concerned.

Why “effectors” may matter

If FASE ultimately refers to multiple effectors rather than a single missile, that could point to the broader direction of future air combat, involving crewed aircraft as well as various uncrewed wingmen.

Tempest is expected to operate as a so-called quarterback, supported by a number of uncrewed combat aircraft, remote carriers, or other systems operating considerably farther forward. Those uncrewed systems will have different size, payload and weapons-carriage constraints from the crewed aircraft.

This means that not every platform will need the same BVR weapon, or even be able to accommodate them, when it comes to the larger missiles.

Instead, a future force might require something resembling a family:

• A large, long-range, high-speed weapon for the crewed Tempest aircraft, optimized for the highest-end air-superiority engagements.
• A medium-sized weapon suitable for existing fighters and potentially future aircraft with more constrained weapons carriage.
• A smaller weapon optimized for CCAs or other uncrewed systems where internal bay dimensions, payload and cost are more restrictive.

A modular missile could possibly cover two of these categories at once. More broadly, these weapons could share technologies without necessarily being identical missiles. Common seekers, electronics, datalinks, software, guidance technologies or other subsystems could potentially be reused across the family.

The result would be a fundamentally different approach from simply developing a single Meteor replacement.

The seeker may be as important as the motor

The front end of a future European BVR weapon is another area where significant change is likely.

An active electronically scanned array (AESA) seeker would seem a logical baseline for a next-generation weapon. The United Kingdom’s previous work with Japan on the Joint New Air-to-Air Missile program, or JNAAM effort was particularly interesting in this regard, given Japan’s experience with active electronically scanned air-to-air seekers.

A future weapon could also incorporate a passive radio-frequency capability alongside its active radar. That would provide another means of detecting or tracking emitting targets and could increase the weapon’s resilience in a heavily contested electromagnetic environment.

For its PL-17 ultra-long-range air-to-air missile, China appears to have chosen a combination of active and passive seekers, although, as Barrie points out, it also appears to have been designed around a very specific target set: E-7 Wedgetail, E-2 Hawkeye, other airborne early warning and control platforms, and support assets, like tankers and strategic electronic surveillance and attack aircraft.

Whether such a capability is worth the additional cost and complexity is another question. A highly sophisticated multimode missile will inevitably be expensive, however, the same technologies could potentially provide utility against a broader range of targets than conventional fighter-on-fighter engagements. An air-to-surface capability should also not be ruled out, with a passive seeker potentially bestowing an anti-radiation missile (ARM) capability on the weapon.

Another passive seeker alternative could be based on an imaging infrared (IIR) sensor. This could provide an interesting complement to an active-radar seeker, making use of the same kind of two-way datalinked midcourse guidance system already included in Meteor. It could be esepcially relevant for engaging small or low-signature (stealthy) targets and in a heavily contested electromagnetic environment.

The weapon is becoming part of the network

Perhaps the biggest change will be the extent to which future BVR missiles exploit the wider kill chain, becoming much more than weapons guided by the aircraft that launches them.

The key requirement is for the missile to be track-source agnostic. This means a future long-range air-to-air missile could receive targeting information from a CCA, an airborne early warning aircraft, another fighter, a naval platform, or potentially space-based sensors.

For example, with Tempest operating alongside forward-deployed CCAs, the sensor that initially detects a target could be the CCA. The launching aircraft could then receive the track, launch a weapon, and continue receiving updates from multiple platforms.

Alternatively, a CCA could launch the weapon using targeting information generated by the crewed aircraft or another sensor elsewhere in the force, provided it is on the network.

Two-way datalinks, midcourse guidance, electronic warfare resilience, and the ability to accept high-quality third-party targeting information become central requirements. Some of this functionality is available, to varying extents, on some current air-to-air missiles, but it will be even more important as air combat becomes increasingly reliant on distributed sensor networks and crewed/uncrewed aircraft teaming.

If it can rely on offboard sensors, the missile’s engagement range no longer needs to be constrained by the organic sensor range of the launching fighter. Faced increasingly by the realities of an anti-access/area-denial (A2/AD) environment, this could enable weapons that fly far beyond what the launch platform could independently detect and engage. The A2/AD threat is alreayd pushing research into much farther-reaching air defese missiles, potentially with a range of up to 1,000 miles.

This also opens the door to more exotic propulsion concepts, including multi-stage weapons designed to combine very high-speed boost with a separate sustain or terminal stage.

The next generation of long-range air-to-air missile may therefore be defined as much by the kill chain they plug into as by the architecture and performance of the missile itself.

What happens to Meteor?

Meteor is one of Europe’s strongest examples of a successful multinational defense program. Six European nations participated in its development, and the program eventually produced a weapon that is widely regarded as a highly capable system.

Now, however, the countries that developed Meteor do not necessarily have identical requirements for the next generation.

The United Kingdom is moving toward GCAP/Tempest with Japan and Italy. Its future combat air requirements will increasingly be shaped by that program and by the threat assessment driving it.

The United Kingdom appears to want a very large, very high-performance weapon optimized for Tempest and the future air-superiority mission, especially in the Indo-Pacific region. Japan likely needs very much the same.

Meanwhile, other Meteor users may prioritize a weapon that can be integrated onto existing fighters and remain affordable in larger numbers.

France’s Comet effort could meet that requirement, since it appears to be a comparatively rapid response to the emerging threat. With that in mind, France could eventually find itself with a near-term weapon, a future clean-sheet requirement, and a continuing relationship with the Meteor family, all while pursuing its own future combat air requirements.

Overall, it is far from clear whether the Meteor consortium will survive for another generation, at least in its current form.

Could Japan become part of the answer?

Given that it’s a partner in GCAP/Tempest, and based on its previous air-to-air missile studies with the British, Japan is particularly interesting in this context.

Japan faces a threat environment in which long-range air combat is of obvious importance, and Japan has already demonstrated advanced capabilities in active electronically scanned air-to-air seekers. The Japanese-developed Mitsubishi AAM-4B became the first air-to-air missile to feature an AESA seeker.

Although earlier air-to-air missile cooperation between Japan and the United Kingdom did not evolve into an operational program, the two countries are now developing a combat aircraft together through GCAP.

With Britain and Japan designing the future combat aircraft together, they could eventually develop some of its principal weapons together as well, although Italy’s requirements are likely very different.

Thinking beyond the missile

Europe can almost certainly build a faster missile than Meteor, but there are plenty more questions about what kind of air combat system that missile — or missiles — will fit into.

A future BVR weapon will have to operate from multiple types of platforms (crewed and uncrewed), receive targeting data from offboard sensors, communicate with CCAs, function in a highly contested electromagnetic environment, engage maneuvering targets at extreme range, and retain enough energy to remain dangerous in the terminal phase.

Increasingly, it seems that, rather than a single weapon, a family of effectors will be the solution.

For the United Kingdom, FASE may become one of the most important programs to watch because it could reveal how Britain intends to bridge the gap between Meteor and the weapons of the GCAP/Tempest era. At this stage, FASE appears to be ‘for U.K. eyes only,’ although Japan and Italy would appear to be likely beneficiaries, due to their teaming on GCAP.

Elsewhere, Comet could provide an early indication of how France intends to respond to the emerging long-range missile threat while maintaining flexibility for a future system.

And for the wider Meteor consortium, it remains to be seen whether the program’s success can be carried forward into another multinational weapon, or whether the emergence of GCAP/Tempest and increasingly divergent national requirements marks the beginning of the end for the Meteor model.

Either way, the next generation of European BVR weapons is likely to be larger, faster, more networked, and more deeply integrated with the combat air system around it. At the same time, the need to create a family of effectors designed around a distributed force of crewed aircraft, CCAs, and offboard sensors will bring some formidable challenges.

Contact the author: thomas@thewarzone.com

The U.S. Navy made a major splash this weekend when it revealed the existence of the AIM-424 Malice Long-Range Air-to-Air Missile (LRAAM), which is already deep in development. At the same time, the service also highlighted plans for a new Compact Air-to-Air Missile (CAAM) optimized for shorter-range engagements and internal carriage on stealthy fighters like the F-35 and future drones as part of its larger future missile vision. Readers can first get caught up on what is known about the long-range AIM-424 in our initial reporting on that missile here.

As described so far, the core goals for CAAM sound virtually identical to what the service has outlined previously in relation to a “Compact Variant” of the AIM-9X Sidewinder (AIM-9X CV), which TWZ was first to report on. A missile in this general category would offer a boost in magazine depth that could be especially valuable for more localized defense of carriers and other high-value assets against large waves of missiles and drones.

The “Compact Air-to-Air Missile (CAAM) effort is a future inner boundary weapon. Requirements are being evaluated and assessed by N98 [the Air Warfare Division of the Office of the Chief of Naval Operations] at this time,” a Navy official told TWZ when asked for more information. “The Navy does not plan to provide routine updates beyond approved public releases because of operational security and program sensitivity.”

Mention of CAAM was included in the same briefing where the AIM-424 was first unveiled at the Tailhook Association’s annual convention this weekend. A central focus of the CAAM is on “increasing internal carriage capacity for inner boundary weapon,” according to that presentation.

For the Navy, at present, “internal carriage” is a consideration most applicable to the service’s F-35Cs and, by extension, other variants of the Joint Strike Fighter. Internal weapons bays will also be a feature on whatever design the Navy may ultimately select as its future sixth-generation carrier-based combat jet, currently referred to as F/A-XX. Future Collaborative Combat Aircraft (CCA) type drones or other uncrewed aircraft the service might acquire in the future could also have internal bays. We will come back to this later on.

The description of CAAM as an “inner boundary weapon” points to a focus on shorter-range engagements, where there could also be less total time to react overall.

In terms of what the Navy’s core requirements for the CAAM might be beyond internal carriage, details are limited. A rendering included in the presentation at Tailhook this weekend shows a relatively generic-looking design with fins only at the tail and a yellow band around the front of the body indicating the presence of a high-explosive warhead.

However, earlier this year, the Naval Air Warfare Center Weapons Division (NAWCWD), part of Naval Air Systems Command (NAVAIR), did put out a contracting notice regarding rocket motor developments to support CAAM and other developments.

NAWCWD “intends to procure on a Full and Open competition basis to develop and demonstrate technology that results in greatly enhanced kinematic capability for the next generation of tactical missiles,” the notice explained. “To support this technological development efforts, NAWCWD is interested in maturing high total impulse loaded and energy tailorable solid propulsion systems for transition into compact weapon systems, including a Compact Air-to-Air Missile (CAAM).”

“Requirements will include tasking and products needed to provide a Concept Design with build-to-print data package, identify critical technology gaps, conduct critical component and rocket motor experiments, conduct a Design for Manufacturing & Assembly study to identify features required to meet manufacturing and cost goals, and provide a plan to mature the CAAM HLG Concept Design to a maturity state ready to enter a Department of Defense (DOD) Engineering and Manufacturing Development (EMD) program,” the notice added.

“HLG” here stands for “Highly Loaded Grain.” This, in turn, refers to solid-fuel rocket motors designed to maximize output per volume. This is an area of missile technology where the Navy has already been heavily investing for years with a broad eye toward increasing the range and improving the performance of future missiles. Furthermore, a missile with an HLG rocket could offer substantially increased capability over a similarly-sized design with a non-HLG motor. This, in turn, offers particular advantages when designing missiles for carriage in internal bays with rigid dimensions.

“The Next-Generation Highly Loaded Grain project team has matured the technology and seeded the development of future mission-modular propulsion systems that can increase weapon ranges by up to 1.5x while maintaining inner boundaries for short-range and time-critical missions,” according to one fact sheet detailing notable achievements by NAVAIR’s Naval Air Warfare Center Weapons Division (NAWCAD) in 2023. Note here also the explicit mention of ‘inner boundary’ design considerations.

As mentioned earlier, the Navy has previously used virtually identical language to describe the planned AIM-9X CV, which is also a joint program with the U.S. Air Force.

“The AIM-9X CV repackages the SIP IV technology into a compact airframe optimized for internal carriage on advanced aircraft with improved kinematic performance,” according to the Navy’s Fiscal Year 2027 budget request, released earlier this year. “The program will deliver increased capability to the warfighter with greater standoff range, increased aircraft weapon station capacity, and maintains inner boundary performance.”

How exactly the CAAM and the AIM-9X CV programs may be related is unknown, but they clearly have the same general goals if they are not different names for the same development effort. From what was shown this weekend, CAAM is a distinctly different-looking missile from the AIM-9X, and plans for a compact Sidewinder variant or derivative could also be a stepping stone to a new design intended to fill the same general role.

U.S. defense contractors have been publicly showing concepts for compact air-to-air missiles for years now. This includes Raytheon’s Peregrine, unveiled in 2019, which was said to be roughly half the size of an AIM-120 Advanced Medium Range Air-to-Air Missile (AMRAAM) while still offering comparable range. The company said it also had equivalent maneuverability to current-generation Sidewinders. Raytheon is the prime contractor for the AIM-120 and the AIM-9, as well as the newly unveiled AIM-424.

In the late 2010s, Boeing also put forward a concept for a multi-stage Long-Range Air-to-Air Missile (LRAAM), which had a design that raised the possibility of whether the first stage could be used as a more compact, stand-alone weapon. In 2022, Boeing notably received funding for further development of that missile under a contract from the Air Force Research Laboratory (AFRL) to “investigate advanced missile sub-system components to support the Compact Air-to-Air Missile [CAAM] and Extended Range Air-to-Air Missile Systems [ERAAM].”

During the 2010s, Lockheed Martin promoted a compact anti-air missile design called Cuda, with a focus on internal carriage, as well. However, Cuda had largely disappeared from the company’s marketing materials by the end of the decade.

Regardless, the use case for such a CAAM-type missile is clear-cut, especially for the Navy and its carrier air wings. In particular, the service is facing a threat ecosystem that is rapidly evolving in scale and scope, including multiple different classes of anti-ship missiles (ballistic, cruise, hypersonic) and long-range one-way attack drones. There is a very real prospect of large-volume and complex attacks made up of very different tiers of weapons incoming from multiple vectors simultaneously, creating a greater risk that both long- and short-range defenses will be overwhelmed. TWZ previously explored this reality in depth in discussing how the long-range AIM-174B, an air-launched version of the Standard Missile-6 (SM-6) that was officially unveiled in 2024, fits into the service’s larger plans.

How The Navy’s New Very Long-Range AIM-174 Will Pierce China’s Anti-Access Bubble

Added localized defensive capability and capacity could also be relevant for aerial force packages pressing their way to a target in hostile territory, where similarly growing aerial threats could materialize suddenly and in close proximity. Depending on its capabilities, CAAM might even be able to provide a new layer of defensive capability against incoming anti-air missiles, including for larger aircraft. So, giving individual aircraft more total engagement opportunities will only become more valuable, if not vital, as time goes on.

As noted, stealth platforms with limited internal bay space face particular constraints in this regard. For years, more magazine depth via smaller missiles has been seen as a key avenue for improving payload limitations for platforms like the F-35 and F-22 when operating in their most low-observable (stealthy) configuration. In many scenarios, these aircraft can get closer to their targets without detection, offering different options for the employment of what could be shorter-range weapons. A compact air-to-air missile design that still offers comparable performance to larger existing designs, through the use of a high-load-grain rocket motor and other features, would be even more of a boon. Having something that is capable of short-to-intermediate-range engagements, but that can be loaded in greater numbers internally would expand tactical flexibility, amplify lethality, and increase utility of the aircraft as they can down more targets on a single sortie in certain scenarios.

The continued growth of drone threats, especially those posed by long-range one-way attack types, has added another dimension to this equation. Limited magazine depth limits the ability to rapidly retask stealthy platforms to respond to often unpredictable high-volume drone attacks. Furthermore, the anti-air version of the 70mm Advanced Precision Kill Weapon System II (APKWS II) laser-guided rocket, the U.S. military’s current go-to lower-cost air-to-air weapon against drones, cannot be fired at all from the internal bays on the F-35 or the F-22. CAAM can offer the ability to address these threats better than aircraft like the F-35 and F-22 can today.

A weapon like CAAM would also be especially relevant for future collaborative combat aircraft, which have extreme constraints on payload capacity, internal and external, as well as total takeoff weight. For CCA-type uncrewed aircraft, keeping the airframe size as small as possible to meet requirements is also essential for meeting affordability and producibility targets. Arming these platforms with an AIM-120-sized missile might not necessarily be required, or even be ideal, especially when operating along the leading edge of the air-to-air battle, closer to threats. In those scenarios, having the option of carrying even twice as many missiles per sortie, internally (if available) or externally, even if they have shorter reach, could be hugely beneficial.

There could easily be interest in a CAAM-like missile from other branches of the U.S. military, if it is not already a joint service effort. The Air Force is already known to be involved in the AIM-9X CV effort. The service has publicly pursued new compact and lower-cost air-to-air missile concepts over the years under various different project names. This includes its own CAAM effort, through which Boeing previously received funding.

What is clear now is that the Navy is pushing to maximize the anti-air capabilities of its aircraft at both the shorter- and longer-range ends of the engagement spectrum.

Contact the author: joe@twz.com

Big news has broken out of the Tailhook Association’s convention in Reno, Nevada this weekend. The Navy has disclosed the existence of an all-new very long-range air-to-air missile, the AIM-424 “Malice.” An image released by the Navy taken last April shows a Super Hornet from Navy Air Test And Evaluation Squadron 23 (VX-23) loaded with four of the weapons. Another image shows the missile installed in an F-35C’s weapons bay.

The news of the new missile was first reported by our friends Brian Everstine and Steve Trimble over at Aviation Week.

The AIM-424 Long Range Air-to-Air Missile (LRAAM), which is already deep in testing, is meant to arm F/A-18E/F Super Hornets, F-35C Joint Strike Fighters and the upcoming F/A-XX next-generation naval fighter. The missile is clearly larger and significantly farther-reaching than the long-serving AIM-120 AMRAAM and the new AIM-260 Joint Advanced Tactical Missile, which shares the AIM-120’s general mold-line. It isn’t known where Malice slots in next to the very far-reaching AIM-174B “Gunslinger,” which was adapted from the Navy’s surface-launched SM-6. According to Aviation Week, the missile is a two-stage design, which should result in extreme range and very high-speed.

The Pentagon has been interested in multi-stage air-to-air missiles for years and is now floating the goal of developing extreme-range air-to-air weapons that can reach out to the 1,000-mile mark in the years to come. This number is seen as critical to surviving future enemy anti-access capabilities of equal reach and to take advantage of very long-distance kill chains that will dominate future combat.

In addition, closing the air-to-air missile gap, specifically with China, and attempting to leap significantly in front of the PLA’s capabilities in this regard, has become a top priority for the Pentagon. A multitude of classified programs to develop new and more capable air-to-air missiles have been well underway and now we are seeing yet another example of this work in the form of Malice. One of these secretive programs, the Long-Range Engagement Weapon (LREW,), date back at least a decade, which also point to the development of multi-stage air-to-air weapons.

While we don’t know for certain the manufacturer that built this weapon or if this is its only configuration,

It also isn’t clear if this new weapon has other secondary modes, such as anti-ballistic missile and/or air-to-surface capabilities, nor what types of flying targets it is intended to destroy. For instance, is it capable of hitting maneuverable fighters at extreme distances as well as lumbering force multiplying support aircraft? Again, we don’t know at this time.

We will be doing additional analysis reporting on this weapon soon, stay tuned.

Contact the author: Tyler@twz.com

UPDATE:

We now have a specifications page from the Navy. The highlights include a weight of 1500 pounds (roughly three times that of an AIM-120), and a range in excess of 250NM. Keep in mind that these figures may be intentionally skewed for counter-intelligence purposes, as is often the case, in particular the range figure. Regardless, this weapon possibly sits in between the AIM-260 and the AIM-174B Gunslinger in terms of range, and closer to the latter. We also know the missile is built by Raytheon.

The product page reads:

The Department of Navy is developing the Air Intercept Missile (AIM)-424 Long Range Air to Air Missile (LRAAM), a next-generation missile intended to strengthen fleet defense and maintain a decisive air domain overmatch against advanced threats. Also known as Malice, LRAAM directly supports the Department’s contribution to integrated deterrence by increasing range, lethality, and combat effectiveness for Marine and Naval aviation forces that are defending our fleets, our interests, and our homeland.

LRAAM sustains the Department’s first look, first shot, first kill advantage by providing our aviators greater reach, greater survivability, and greater tactical flexibility in the air-to-air fight. Built for 4^th, 5^th, and 6^th generation platforms, LRAAM is designed for the air wing of today and the future.

Specifications

Primary Function: Air-to-Air Missile

Contractor: Raytheon

Propulsion: Solid-propellant rocket motor

Length: 13.5 feet (4.11 meters)

Diameter: 13.5 inches (0.34 meters)

Wingspan: 26.2 inches (0.67 meters)

Weight: 1500 pounds (680.4 kg)

Range: In excess of 250 nm (463 km)

Warhead: Blast fragmentation

*Author’s note, similarities of the design to a Boeing concept was removed due to the manufacturer being disclosed by the Navy