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Iran also has extensive underground ‘missile cities’ and other hardened sites that launchers can sprint to and from, and even fire from within in some cases. Beyond the main missile storage and launch sites, Iranian authorities have clearly had plans to disperse these weapons across the country. Reports have said that more authority to employ them has been delegated to lower echelons of command to minimize the impacts of separate U.S. and Israeli strikes on command and control nodes, as well.

On top of all this, Iran still has longer-ranged ballistic missiles that it can fire from areas further to the east, where the volume of U.S. and Israeli strikes has only more recently begun to grow. What’s left of Iran’s air defenses, which presents a real threat, is therefore likely to be more intact in those regions. In general, many of Iran’s air defense systems are also road mobile and can pop-up suddenly. All of this creates challenges for finding and fixing Iran’s remaining launch capacity, let alone neutralizing it.

In this context, there is a clear need to be able to readily detect launchers, which can pop out suddenly and unexpectedly from cover, across vast areas. Known missile storage sites and launch areas around them also need to be persistently surveilled. The ability to find launchers faster opens up new options for striking them. Just tracking and recording their typical movements would also help further refine interdiction and intelligence-gathering strategies going forward.

As TWZ has previously explored in great depth, the RQ-180 is best understood as a very high-flying, very long-endurance, and very stealthy intelligence, surveillance, reconnaissance platform that is capable of penetrating and persisting deep into enemy airspace. Its primary means of achieving that mission would be a radar with ground moving target indicator (GMTI) and synthetic aperture radar (SAR) capabilities, but radar would be just the primary component of a larger sensor package, which would likely include powerful electro-optical sensors and passive radiofrequency ones.

At its most basic, GMTI allows battle managers to see the enemy’s ground movements in real-time and then quickly adapt their game plan to counter those enemy forces before they can ever attack, or even pose a threat to friendly forces. GMTI is also a critical capability for detecting changes in force posture, establishing patterns of enemy movements over time, and identifying new targets of interest. Modern GMTI products can also be looped into a ‘kill web’ for rapid targeting purposes.

Some of this is also achieved through the aforementioned SAR mode, which basically provides a satellite-like image of a target area using radar. It also has the ability to see some things optical systems cannot, and, like GMTI, it can work under nearly all atmospheric conditions, day or night. When paired with GMTI, SAR can be used to help positively identify targets, as well as gain better situational awareness about the targets being tracked.

Passive electronic intelligence collection that allows for radiofrequency-emitters to be quickly detected and geolocated via onboard antennas and interferometry-based computing is another part of the equation. Long-range optical sensors can also provide higher-fidelity intelligence and spot movements of infrared signatures over large areas. You can imagine how fuzing all these capabilities together, combined with advanced networking, on a single platform could be incredibly potent. Basically, detecting a target or target group of interest, and then training advanced sensors on it to rapidly build up a high-quality understanding of what is going on and even to provide real-time targeting data to ‘shooters’ would be this aircraft’s bread and butter.

All of these are capabilities that would be ideally suited to the very high-priority task at hand of searching for Iranian launchers across the country’s vast terrain.

This all brings us back to Quartz and the very specific mission set that drove that program. Quartz is the best-known codename for a drone conceived as part of what was officially dubbed the Advanced Airborne Reconnaissance System, or AARS program.

The lead-up to Quartz

AARS/Quartz was itself born out of a succession of earlier developments. Proving that using a stealth platform to penetrate enemy air defenses and to stay over contested territory for hours on end while transmitting data collected without being detected is one of the biggest revolutions in warfare of the 20th Century. This capability was demonstrated on the tactical side at the dawn of stealth technology by Northrop’s Tacit Blue. That aircraft was developed as part of the Defense Advanced Research Projects Agency’s (DARPA) highly classified Battlefield Surveillance Aircraft-Experimental (BSAX) program, which began in the late 1970s. 

Tacit Blue notably served as a periphery risk reduction effort for the Advanced Technology Bomber (ATB) program that would result in the B-2. However, its reason for being was to show that a stealthy aircraft carrying a huge radar can penetrate enemy air defenses and loiter for prolonged periods of time, collecting GMTI radar data and other intelligence information.

The radar for BSAX was a low probability of intercept design that had come from Pave Mover, another DARPA effort. Pave Mover ultimately led to the non-stealthy and now-retired E-8 Joint Surveillance Target Attack Radar System (JSTARS) aircraft, but offshoots of that radar technology did end up elsewhere, including on the B-2. Low probability of intercept/low probability of detection (LPI/LPD) radars and communications suites are now key tenets of stealth aircraft design, in general. Keeping signal emissions, which an enemy can use to spot and track threats, to a minimum is critical for low-observable (stealthy) aircraft designs. Pave Mover was also tied into DARPA’s Assault Breaker program, which focused on proving out various technologies to enable standoff targeting of enemy forces, especially large Soviet armored formations on the move, deep behind the front lines.

The famously ugly Tacit Blue, also nicknamed the “Whale,” produced results that were revolutionary, as you can read more about here. Even the most capable existing penetrating intelligence, surveillance, and reconnaissance (ISR) aircraft available at the time, like the SR-71 Blackbird, could only take a snapshot in time of the enemy and its posture. Satellites were far more predictable and could only provide the same ‘moment in time’ intelligence, and in a much less flexible manner. Tacit Blue could watch for hours with the enemy not even knowing it was there.

This meant the quality of intelligence Tacit Blue was capable of collecting was of far greater value. Metaphorically speaking, the SR-71 was like documenting a wedding by loudly running through a crowd and snapping a few photos. Tacit Blue was like rolling hours of videotape at the same wedding by an invisible cameraman. It was an absolute game-changer. The information was also transmitted securely using a LPI data link in near-real-time so that it could be rapidly exploited, not once the aircraft returned to base.

A drone to hunt Soviet mobile ballistic missiles

AARS/Quartz can be seen as something of a strategic parallel to the more tactically-minded BSAX effort and the Tacit Blue demonstrator. It was conceived as a cooperative effort between the U.S. Air Force, the National Reconnaissance Office (NRO), and the Central Intelligence Agency (CIA). NRO, the very existence of which was only declassified in 1992, is and has historically been responsible primarily for intelligence-gathering via satellite. However, it was also involved in ISR drone operations in the 1960s and 1970s.

In the 1980s, the Reagan Administration grew concerned about a gap in reconnaissance assets, in the air and in space, to persistently track and monitor Soviet mobile nuclear-armed intermediate-range and intercontinental ballistic missiles.

“As spy satellite systems came on line in the 1960s, they shared the same fundamental operational scheme as the SR-71. Both conducted reconnaissance with relative impunity but were so fast that they only provided episodic coverage. The Soviet system of fixed air bases, missile silos, and command centers of the Cold War’s first 30 years favored ‘fast pass’ reconnaissance, however, so its weaknesses were not evident until the strategic equation shifted in the late 1970s,” Thomas Ehrhard wrote in a monograph, titled Air Force UAVs: The Secret History, which the Mitchell Institute for Airpower Studies published in 2010. “Soviet mobile missiles (both nuclear and air-to-air) and the advance of aviation technology opened the door for a true loitering surveillance UAV called AARS.”

Ehrhard pointed to three missiles as particular drivers behind the AARS program. The first of these was the road-mobile RSD-10 Pioneer, known in the West as the SS-20 Saber, a nuclear-armed intermediate-range ballistic missile (IRBM) with three warheads in a multiple independently targetable reentry vehicle (MIRV) configuration. The SS-20 had an immensely destabilizing impact on the security environment in Europe. Its appearance was a central factor in the United States and the Soviet Union ultimately signing the Intermediate-Range Nuclear Forces (INF) Treaty in 1987.

Contemporary reports said that the Soviets were also looking into an intercontinental ballistic missile (ICBM) based on the SS-20, which itself may have been the result of an abortive ICBM program. After the Soviet Union fell, Russia subsequently developed the RS-26 Rubezh, which it described as an ICBM, but many believed it to actually be an IRBM akin to the SS-20. The INF treaty ultimately collapsed in 2019, rendering the issue moot. Five years later, a new Russian intermediate-range missile, called Oreshnik, emerged after one was fired at Ukraine. The U.S. government has assessed Oreshnik to be based on the RS-26.

The other Soviet missiles that helped make the case for AARS/Quartz were two ICBMs, the rail-mobile RT-23 Molodets (SS-24 Scalpel) and the road-mobile RT-2PM/RS-12M Topol (SS-25 Sickle).

RT-23/SS-24 SCALPEL MOD 1 ICBM

RT-2PM/SS-25 SICKLE ICBM

In his 2010 monograph, Ehrhard describes the Reagan-era view of the resulting problem set as follows:

“The technological problem of holding these mobile missiles at risk, one that NATO had never solved with the SS-20, now became vastly more complex [with the inclusion of the SS-24 and SS-25]. U.S. forces had to constantly monitor their movement and electronic emissions, something neither fast-pass satellites, U-2s, nor the SR-71 could accomplish. The mission also entailed breaking the over two decade-long declaratory policy of not overflying the Soviet Union, a prospect the Reagan Administration apparently felt was worth the gain. To complicate matters further, they needed a platform that could track those missiles in a nuclear detonation environment while flying from remote bases in the continental US. Operating and receiving imagery from such a craft beyond line-of-sight using space relays would prove daunting. The political and design challenges loomed large, but in the end the Air Force/NRO/CIA consortium opted for a leap-ahead system.”

With all this in mind, AARS/Quartz was seen as a national imperative. The very long-endurance drone, penetrating deep into Soviet airspace, would be able to locate many of these threats, allowing them to be targeted during the opening throes of a potential apocalypse – something we will come back to later on.

By the mid-1980s, contracts were doled out to Lockheed and Boeing to develop what at the time could be seen as the most ambitious ‘silver bullet’ aerospace program of its time, albeit one that had very few eyes on it as it was deeply buried in the classified realm. Ehrhard writes:

“To accomplish the loitering surveillance mission, this UAV needed autonomous (i.e., not remote controlled), highly reliable flight controls, and a design capable of intercontinental ranges from bases in the US zone of the interior with extreme high altitude capability (long wingspan with sailplane-type lift and multi-engine propulsion to reach altitudes more than 70,000 feet). Moreover, it had to carry an array of high-resolution sensors, high-capacity satellite communications capabilities, and various antennas—all in a package that was stealthy to the point of being covert. The cost of developing each technology piece alone would be staggering, but integrating them presented an even greater challenge – thus the project became a magnet for the best and most starry-eyed technologists in the black world. As one CIA engineer said in an anonymous interview, this project was ‘the cat’s pajamas,’ and ‘the single most fun project I ever worked on’ because it stretched every conceivable technology area.”

Ehrhard does not elaborate on the expected sensor package, but an LPI/LPD radar with GMTI and SAR modes, as well as other sensors, would have been needed for a stealthy platform tasked with this mission set. As noted earlier, electronic emissions, which can be detected passively, were also seen at this time as a key way to spot and track mobile missile launchers.

A highly ambitious undertaking

By all indications, AARS/Quartz was seen as a very ambitious effort from the start, but one that could yield impressive capabilities needed to address a mission requirement critical to national security. It should be noted that the U.S. military was pursuing a host of advanced stealth aviation technology programs at around the same time. Many of the efforts would go on to produce real results, if they hadn’t already by the mid-1980s, and this is just based on what is known publicly. Northrop’s stealthy Tacit Blue demonstrator flew for the first time in 1982. Lockheed’s F-117 Nighthawk reached an initial operational capability the following year. The Advanced Technology Bomber (ATB) program that would lead to the B-2 was well underway by this time, too.

In the end, AARS/Quartz did not fare as well as many of its contemporaries, at least from what we know. The program ran through the end of the Reagan years and into the 1990s under the administration of President George H.W. Bush. It morphed and changed hands considerably from a smaller ‘bleeding-edge’ NRO-led program into one that was integrated into a new national unmanned aircraft strategy. This, in turn, caused its mission set to balloon as a maelstrom of stakeholders demanded many capabilities out of a single platform that was already beyond the available technology of the era.

Ehrhard’s 2010 monograph sums up just how bloated AARS became by the 1990s:

“[David A.] Kier[, NRO’s Deputy Director from 1997 to 2001] said the large version of AARS, which according to some reports had a wingspan of 250 feet, cost less than a B-2, but more than $1 billion a copy. Reportedly, the production plan called for only eight vehicles at a cost of $10 billion, each of the vehicles capable of an amazing 40 hours on station after flying to the area of interest.”

“Air Force officials were so leery of the UAV’s autonomous flight concept (no pilot had moment-to-moment control) that they reportedly insisted the flying prototype carry a pilot to handle in-flight anomalies and that the final design include a modular, two-place cockpit insert to make it optionally piloted. ‘By the time everyone got their wishes included,’ Kier said, ‘it [AARS] had to do everything but milk the cow and communicate with the world while doing it.’”

“With all of AARS’s leading-edge sensors and communications links, each of which posed substantial technical challenges in its own right, flight reliability quickly became the biggest design hurdle, according to Kier. The technologies were so secret, and the value of the payload and the air vehicle was so great that its loss over unfriendly territory was unthinkable. One defense official remarked, ‘If one had crashed, it would have been so classified we would have had to bomb it to ensure it was destroyed.’”

“Sailing along on the glut of black money in the late 1980s, AARS kept moving forward despite its continually expanding, problematic requirements list. As happened with [the] D-21 and Compass Arrow [drone programs] in the early 1970s, however, AARS was about to have its most vital mission curtailed.”

“The end of the Cold War brought the expensive program to a halt. An Air Force general familiar with the project said: ‘When AARS was invented, there was more money than they [the NRO] could spend. After the Cold War, the money went away and projects like that could not possibly survive.’ Like predators stalking a wounded animal, manned alternatives to AARS emerged. One proposal would put a sophisticated target acquisition system on the B-2 stealth bomber – the so-called RB-2 configuration. The proposal had value as a terminal tracking system, but the RB-2 lacked a method of off-board cueing to direct it to a search area.”

…

“As it turned out, none of the alternative programs made the cut, for not only was the Cold War officially over with the dissolution of the Soviet Union, but the venerable Strategic Air Command was disbanded in June 1992. With that move, AARS lost its primary military constituent and the AARS alliance began to crumble.”

“…The Air Force pulled funding on AARS, and it was terminated in December 1992 by the intelligence community hierarchy just as it was to enter full scale development. AARS was, in the final analysis, a misfit. It was a major aircraft program backed by a satellite organization (the NRO), and a risky unmanned surveillance platform slated for a combat pilot-led Air Force—hardly an edifice solid enough to survive the removal of its strategic underpinnings. No one organization provided focus or advocacy for the program. As a result, the “perfect” surveillance UAV faded away even as the ultimate Cold War satellite system, Milstar, and the equally exotic B-2 stealth bomber managed to survive, backed as they were by one service, and powerful sub-groups within that service, who were culturally and operationally attuned to those configurations.”

By 1990, Lockheed and Boeing are also said to have been directed to combine their previously separate work on AARS/Quartz.

Kier, who Ehrhard also identifies as the last AARS program manager, says the drone’s design ultimately evolved into something that “resembled a substantially scaled-up version of DARPA’s DarkStar.” Lockheed’s DarkStar, which eventually received the designation RQ-3, was a stealthy tailless design with an ovoid central fuselage and with very long, slender, and straight main wings. Boeing was also a major subcontractor for the RQ-3.

DarkStar was also referred to as “Tier III-minus,” a moniker that reflected the requirements for the drone, which were truncated compared to a planned Tier III type. Tier III was a more direct follow-on to AARS, but was already envisioned as a smaller and less capable, and one would imagine less expensive, uncrewed aircraft. There were also additional lower capability tiers, one of which ultimately led to the RQ-4 Global Hawk. Ehrhard says some members of Congress and of industry did attempt to drum up support for a true successor to AARS/Quartz, unofficially referred to as Tier IV, but without success.

With regard to the RQ-3, at least two flying examples were built, the first of which crashed in 1996 after suffering a control system malfunction. DarkStar had vanished completely from the public eye by 1999, but it has since emerged that a direct line can be traced between it and the stealthy RQ-170 Sentinel via another secretive drone called the X-44A, which TWZ was first to report on back in 2019.

When it comes to AARS/Quartz, the full scale and scope of what exactly came out of the hundreds of millions, and possibly billions, spent on the program over at least a decade, remains unclear. Clearly, major leaps were made in the critical communications, command and control, structural, and sensor technologies needed to make the system a reality. There are rumors that sub-scale risk-reduction test articles were flown, but details surrounding the program remain highly secretive. 

A mission requirement that rhymes

As we noted earlier, many questions remain about the RQ-180, as well as the overall status of that program. At the same time, fast forward some three decades or so from the end of AARS (and its immediate successors), and there are now echoes of the Cold War mission requirements that prompted that program, including in the current conflict with Iran.

The Iranian arsenal of conventionally-armed missiles is not anywhere near the same kind of threat as Soviet nuclear-tipped IRBMs and ICBMs. Still, they do present very real threats, especially for strikes on large critical infrastructure targets and as terror weapons when loaded with cluster munition payloads. The current conflict has demonstrated that strategy also puts immense strain on Israeli missile defenses, which could have broader ramifications, as you can read more about here. Iran’s short-range ballistic missiles offer additional flexibility against targets on land or at sea. In addition, it has been clear for years now that Iran is very willing to launch conventional ballistic missile attacks.

As already noted, the launchers for these missiles are mobile, and some are configured to look like typical civilian-style trucks at a casual glance. Some operate from hardened and underground bases. A number of those facilities were even built with ports that allow missiles to be fired from within, though it is unclear how extensively Iran has made use of that capability in the current conflict. These apertures have likely been repeatedly struck by the U.S. and Israel.

The underlying challenge of finding Iran’s ballistic missiles, and doing so with enough time to attempt to strike them before they launch, has clear similarities to the mission that drove AARS/Quartz. The Iranian case is perhaps more complex in certain respects, given the larger number of smaller missiles, many of which could be dispersed over a broad area. Still, the long-range weapons that threaten Israel are clearly the top priority and would be the easiest to spot for an asset like the RQ-180.

Furthermore, Iran’s air defenses have been significantly degraded after some five weeks of U.S. and Israeli strikes, on top of the losses during the 12 Day War last year, but threats remain. As noted, the northeastern end of the country has seen fewer strikes compared to other areas, overall. Total air supremacy over Iran has yet to be achieved.

This is not a hypothetical assessment either, as underscored by the recent loss of a U.S. Air Force F-15E Strike Eagle. In the ensuing efforts to recover the F-15E’s crew, an A-10 Warthog crashed after being hit by hostile fire and two rescue helicopters were also damaged. American forces deliberately destroyed additional aircraft – reportedly two MC-130J special operations tanker transports and four Little Bird helicopters – inside Iran to prevent the capture of sensitive material. This came after the MC-130Js had become disabled after touching down at an austere operating location during the final mission to retrieve the downed Strike Eagle’s Weapon System Officer.

Last month, a U.S. Air Force F-35A fighter also had to make an emergency landing after reportedly being hit by an Iranian surface-to-air missile. In addition to damage to the aircraft, there are reports that the pilot suffered shrapnel wounds, as well. There have been reports of other close calls since the conflict began.

This is exactly the environment where a very high-flying, extremely long-endurance, and very stealthy drone, like the RQ-180, would be valuable, if not critical, to perform the aforementioned mission. The drone would simply fly outside the range of Iranian defenses if need be and likely fly nearly directly over most of them without fear of being shot down. From that perch, which could be far above where normal jet aircraft fly (60,000-70,000+ feet is possible) it would be able to monitor massive swathes of Iranian territory for movement of launchers and indications of launches, especially around known launch areas and storage sites.

It is also important to note here that much has changed in the past 20 years, let alone the past 40, which makes a successor to the AARS/Quartz concept more viable now, in general. Massive leaps have been made in every single relevant technological area. Examples include the fielding of operational semi-autonomous high-altitude, long-endurance drones, huge breakthroughs in composite structures and satellite data links, and the miniaturization of highly-powerful sensor systems. Just the available satellite bandwidth alone and the increases in onboard computing power were so far advanced by the mid-2000s already compared to the 1980s. Added to that now is the ability to crunch through all the data collected onboard using artificial intelligence and machine learning technologies, which further helps make use of the bandwidth available..

AARS/Quartz was never intended to exist in a vacuum. It was explicitly seen as a part of an ecosystem that also included the B-2 bomber (to strike the targets the drone found) and the Milstar communications satellite constellation (to help transmit relevant data). The B-2 and Milstar did enter service, although the former did so on a very truncated level due to post-Cold War drawdowns. The U.S. military has made further investments since then in advanced networking capabilities as part of integrated kill web architectures. The B-2 and other relevant capabilities that could directly tie in with the RQ-180 are being employed publicly in the current conflict with Iran. It is possible, if not highly plausible, that this integration has already existed for years, in part as a result of the development of the LRS family of systems.

There is a degree of precedent here already, with regard to Iran specifically, with the RQ-170 Sentinel. RQ-170s are understood to have conducted extensive flights over Iran in the 2000s and into the very early 2010s, particularly to provide persistent monitoring of nuclear sites. Those missions were thrust into the public eye in 2011, when an RQ-170 went down in Iran and was captured largely intact.

The fact that the Sentinel has been flying operationally for nearly two decades, at least, also just underscores the degree to which stealthy, persistent drone surveillance capabilities had already advanced decades ago. That being said, the RQ-170 is a medium-altitude platform that was developed as a more tactical-level asset for surveillance of smaller areas. It does not fulfill the continued requirements for something like the RQ-180, able to fly at much higher altitudes over far greater distances for much longer periods of time, while carrying huge sensors, and was never intended to do so.

It’s also worth noting here that any decision to employ a highly secretive and sensitive asset like the RQ-180 over Iran would still carry major risks. Stealth aircraft aren’t invisible or completely immune to threats, and accidents do happen. As noted earlier, a technical issue of some kind may well be the only reason why we got a clear look at the drone during the day at Larissa in Greece, to begin with. At the same time, there is something of a precedent for taking these kinds of risks with regard to Iran, specifically, even outside of the demands of open conflict. After the RQ-170 went down in Iran, it is very likely that Russia and China had opportunities to analyze the drone in detail. But the technologies in the RQ-170, and its very design, are understood to be far less exquisite than what would be found in the RQ-180.

But even as an RQ-180 would have an even more pressing use case against a peer competitor like China, which is drastically expanding its nuclear arsenal and has thousands of road-mobile ballistic missiles, risking such a sensitive asset over Iran is paired with the high stakes involved with this operation, especially in regard to Israel. Iran’s massive and rapidly growing number of long-range missiles were a stated reason Trump decided he had to act now. The administration has said that soon Iran would be able to oversaturate any defenses if action wasn’t taken. It is this same threat that would be a major factor in using such a prized asset for Epic Fury, to do whatever possible to limit the damage to Israel, and to America’s Arab allies as well.

When the secretive drone first emerged at Larissa, comparisons were also drawn to an Israeli design referred to as the RA-01. That uncrewed stealth aircraft has a roughly similar planform, but is a smaller overall design that likely falls between the RQ-170 and the RQ-180. It has been very active during the conflict, being seen in videos. It would be of no surprise if it were tasked with hunting Iranian missile launchers, as well.

It should be stressed that we still do not know for sure why the secretive drone is at Larissa and what operations it might have been conducting, or still is, from the Greek base. As mentioned at the start of this piece, U.S. authorities have, so far, declined to comment on the uncrewed aircraft’s presence there at all.

At the same time, its emergence does come at a time when the capabilities of the RQ-180, or an evolution thereof, would be in extremely high demand to support current operations over Iran, and specifically to address the urgent need to counter Iran’s long-range weapons, just as the progenitor of the concept was meant to do nearly four decades ago.

Contact the author: joe@twz.com