T38

NASA is starting to explore options to fill the gaps that will be left by the eventual retirement of its iconic T-38 Talons. Since the 1960s, NASA has been using the jets to support astronaut training and as chase planes. However, the Talons are aging, supportability is already a problem, and challenges to sustain them further are expected to grow as the U.S. Air Force replaces its T-38 fleet with new T-7A Red Hawks.

The Johnson Space Center (JSC) in Houston, Texas, put out a contracting notice today seeking information about potential T-38 successors. NASA currently has 25 Talons in its inventory, according to the Federal Aviation Administration’s (FAA) online database.

“NASA JSC is conducting market research to obtain industry information regarding availability, capability, schedule, sustainment models, and cost efficacy for modern high-performance jet aircraft that could be used in evaluation and an evaluation program for supporting NASA’s astronaut SFRT [Spaceflight Readiness Training] requirements,” the notice explains. “NASA has operated the T-38N fleet in support of astronaut SFRT for several decades. With the U.S. Air Force planning to retire the T‑38 fleet in the 2030-2035 timeframe, NASA is evaluating options to transition to a more modern high-performance aircraft.”

The T-38N variant is specific to NASA and distinct from the T-38A/B/C variants the Air Force currently operates. The U.S. Naval Test Pilot School also has a handful of T-38Cs. Both the N and C variants are based on the original T-38A, which first entered Air Force service in 1961. The Air Force bailed the first Talons to NASA three years later.

The N models have received various upgrades over the years, including the integration of new modern ‘glass cockpits’ with digital displays starting in the 1990s. As of 2011, compared to contemporary C variants, “the T-38N aircraft includes differences in communications and navigation, such as the addition of weather radar, a data link weather system, the terrain avoidance and warning system, the terminal collision avoidance system, GPS with localizer performance and vertical guidance approach capability, and redesigned electrical, inlet, ejector nozzle, and flight management systems,” according to a report from the National Research Council of the National Academies of Sciences, Engineering, and Medicine.

NASA T-38 Jets In Flight – Cockpit View Captured by Astronaut | Video

Now, “NASA is seeking information on existing, production, or near-production high-performance jet aircraft capable of supporting SFRT,” per today’s contracting notice from the JSC. “NASA is not restricting industry responses to a specific performance class or aircraft design heritage.”

The notice does provide the following list of desired characteristics:

• “High reliability with established maintenance documentation”
• “Self-starting engine capability”
• “Performance comparable to a modern jet trainer/light fighter aircraft”
• “Capability to support dynamic maneuvering, formation flying, and cross-country navigation”
• “Dual-seat, dual-control configuration (tandem or side-by-side)”
• “Modern avionics compatible with instrument flight operations”
• “Aircraft capable of being single-pilot qualified from either seat is highly desired”

“Prior to any fleet transition, NASA seeks to conduct a limited-scope evaluation program using a small number of modern aircraft,” the notice adds. “This evaluation program is not a full fleet buy or replacement. It is intended to operate a small number of aircraft within JSC’s existing operational framework to assess compatibility, logistics, cost efficacy, and training impact.”

Furthermore, “NASA anticipates evaluating a small number of aircraft over a multi-year period,” it continues. “NASA requests information on potential procurement options such as lease, lease-to-own, barter, or other arrangements due to limited upfront procurement funding.”

NASA is looking to be solely responsible for flight operations of the jets, but is expecting contractors to handle maintenance, whether the aircraft are government-owned or not.

The contracting notice does also say that “NASA is open to operating the aircraft under reasonable flight hour limits, maneuver restrictions, or operational envelopes consistent with contractor recommendations.”

Just what kind of limits and restrictions NASA might be willing to accept is unclear. The entire reason for operating the T-38s now is to offer a high-performance platform with a good degree of maneuverability to support the SRFT requirements. These are attributes that are also valuable when flying as a chase plane and otherwise supporting flight research and test activities.

NASA certainly seems to be willing to consider a wide range of potential operations, both in terms of aircraft and operating schemes. When Boeing won the Air Force’s T-X competition to replace the T-38 with what became the T-7A, TWZ noted the possibility that other Talon operators, including NASA, could follow suit.

There are a wide variety of other jet trainers available on the open market. This includes Korea Aerospace Industries’ (KAI) T-50, a design capable of supersonic flight that has been offered on the U.S. market before through a partnership with Lockheed Martin. A version of the T-50 was one of the losing entrants in the Air Force’s T-X competition.

There are several private companies that operate relevant jet trainer types to provide flight training and ‘red air’ aggressor services, too. NASA’s current administrator, Jared Isaacman, founded one of those companies, Draken International, making him once the owner of the world’s largest private air force. He has also personally bought various demilitarized fighters and jet trainers over the years. During this year’s July 4th celebrations in Washington, D.C., he somewhat controversially flew over the nation’s capital in one of the F-5 Tiger II jets that he owns.

With expectations that funding for new jet trainers will be limited, at least initially, NASA could well seek to enter into some kind of new arrangement with the Air Force (or another branch of the U.S. military) just like it did in the 1960s. It’s also worth noting here that the T-7A program continues to suffer significant delays due to technical issues and other factors. This has led the Air Force to repeatedly push back its own T-38 replacement timeline. The service’s original goal was to reach initial operational capability with the Red Hawk in October of last year, but it is now targeting August 2027 to achieve that milestone. A full-rate production decision is now not expected to come until January 2029. So, NASA actually getting any T-7s anytime before the USAF gets all the jets in badly needs is questionable.

There are also no indications that NASA’s SFRT requirements will slow in the meantime, either. If anything, these training demands could grow as work continues toward the resumption of crewed missions to the Moon under the Artemis program. The Artemis IV mission, currently scheduled for 2028, is set to be the first time astronauts have set foot on the lunar surface since Apollo 17 in 1972.

From the wording of today’s contracting notice from JSC, NASA is still some years away from making a final decision on what will come after the T-38N, but the hunt is now on.

Contact the author: joe@twz.com

The U.S. Air Force’s X-62A test jet was able to use its artificial intelligence (AI) driven ‘brain’ to autonomously spot and track other aircraft in flight, and then move to intercept them, in recent testing. On top of this, the AI ‘agent’ on the X-62A performed these tasks by leveraging data from an infrared sensor pod slung underneath the aircraft. The tests demonstrate exactly the kind of autonomous air-to-air combat capabilities the Air Force is hoping to gain from its first batch of operational Collaborative Combat Air (CCA) drones.

The Air Force and Lockheed Martin shared details about the new testing involving the X-62A, which is a uniquely modified F-16, today. The U.S. Air Force Test Pilot School (USAF TPS), Lockheed Martin’s famed Skunk Works advanced projects division, and other unmanned “industry partners” supported what is described variously as a “closed‑loop AI combat test” and a demonstration of “autonomous AI sensor-to-vehicle control.” The X-62A, which started life as a two-seat F-16D Viper and is also known as the Variable Stability In-flight Simulator Test Aircraft (VISTA), is assigned to the USAF TPS. The Air Force also nicknamed this particular test effort Have Heat.

“Leveraging Lockheed Martin’s Infrared Search and Track Legion Pod, during the HAVE HEAT program, the X-62 VISTA platform demonstrated the ability of AI agents to ingest live infrared sensor data, directing the X-62 to autonomously intercept an airborne target in real time,” according to a release from the Air Force’s 412th Test Wing at Edwards Air Force Base in California.

“An artificial intelligence (AI) agent used targeting information from an operational sensor to execute successful air intercepts against a live target,” a separate release from Lockheed Martin also explained. “Across eight flights, the X-62 Variable In-flight Simulation Test Aircraft (VISTA) executed 27 AI-controlled intercepts.”

A T‑38 jet trainer was used as the live target during the tests, per Lockheed Martin.

The Air Force has clearly been building up to tests like Have Heat for years now. The service, together with General Atomics, has notably used the latter company’s MQ-20 Avenger drone equipped with this same pod to demonstrate autonomous target detection and tracking capabilities in the past.

As an aside, it is also worth noting here that Legion Pod has been in active operational use on crewed Air Force fighters for some time now. This reflects a separate renaissance that infrared search and track (IRST) capabilities have been seeing across the U.S. military. IRSTs are especially valuable for helping spot stealthy targets with features designed to reduce their radar cross-sections since they detect and track infrared emissions. By extension, IRSTs are also immune to radio frequency electronic warfare jamming. As passive sensors, they do not emit their own signals that could alert a target to the fact they are being tracked, either. IRSTs can still be used to cue or otherwise be linked to other sensors, including active electronically-scanned array radars. Fusing data from multiple sources can provide higher fidelity tracks of multiple targets, as well as improved situational awareness overall.

Legion Pod Flies on F-16

The Air Force, together with various industry partners, including Lockheed Martin, General Atomics, Shield AI, Anduril, and others, have also made other important strides in autonomous air combat capabilities in recent years. This includes a ground-breaking mock dogfight between the X-62A and a crewed F-16 back in 2024.

What Have Heat has now demonstrated is the ability of an autonomous platform to use its own closed data loop to directly prosecute an aerial intercept of a physical aircraft. It also showed that the parties involved could move “AI testing from simulated target data to real-time, on‑board sensor streams, mirroring the data environment pilots will face in future high-stakes engagements,” Lockheed Martin’s press release notes.

This all speaks to a core challenge in the development of advanced autonomous aircraft: situational awareness limitations. While the aforementioned simulated dogfight in 2024 was a breakthrough event, the Air Force subsequently disclosed that the X-62A and the F-16 had been directly exchanging data the entire time. This, in turn, underscored the difficulties of ensuring an autonomous platform can safely operate closely together with friendly aircraft, let alone engage a non-cooperative hostile threat, as TWZ explored in detail at the time. The Air Force, as well as other branches of the U.S. military, have been open about the need to overcome these hurdles and the difficulties of doing so.

It is also important to note that the commercial and military aviation sectors have been developing and fielding ever-more advanced automated ‘sense and avoid’ systems for crewed aircraft for decades now. This technology has already been working its way into the uncrewed aviation realm. However, at least so far, the main focus has been on flight safety in controlled airspace rather than dynamic air combat operations over hostile territory where threats and other hazards could emerge unexpectedly.

“Our autonomous agents consumed classified infrared search and track feeds and executed combat‑critical maneuvers in real time. This achievement marks a decisive advance toward delivering AI‑augmented air dominance for the United States,” Ron Fehlen, Vice President and General Manager of Lockheed Martin Skunk Works, stressed in a statement today about Have Heat.

“Our ability to provide reliable sensor data is critical, but the real advantage comes when that data can connect seamlessly with AI to take action,” Stacy Kubicek, Vice President and General Manager at Lockheed Martin Sensors and Global Sustainment, also said in a statement. “This project demonstrates how sensing and autonomous AI can come together as a force multiplier to make faster, more informed action in complex environments.”

“HAVE HEAT represents a meaningful expansion of avionics capability towards integrated, AI-driven control of multiple sensors and air vehicles for mission autonomy,” Air Force Lt. Col. Joshua Strafaccia, Dean of Faculty for Research at the USAF TPS, said in his own statement. “This bridges a capability gap and positions us to test advanced autonomy faster.”

As mentioned at the start, for the Air Force more specifically, Have Heat is another important stepping stone toward the air combat capabilities the service wants at least from its initial tranche of CCA drones. Using CCAs as forward IRST nodes is clearly a top priority. Putting the passive sensors out ahead of manned platforms, especially in groups, will generate high-quality target data independent of radars that even stealth aircraft cannot hide from. It will also help with survivability of the drones compared to equipping them with radars, but some will likely be equipped that way, as well. With all this in mind, IRST has already been emerging as a key capability for CCA-type programs more broadly, and not just in the United States.

The service’s initial CCA fleet is set to be made up of a mix of General Atomics FQ-42 Dark Merlin and Anduril FQ-44 Fury types. The Air Force is already using pre-production versions of those drones to help develop new concepts of operations and tactics, techniques, and procedures to go with them. This includes an operational test at Creech Air Force Base in Nevada just last month, which TWZ was first to report.

The Air Force does still see human operators at least being on the loop for the foreseeable future, especially to authorize lethal attacks. The service’s F-22 Raptors are in line to be the first airborne controllers for operational CCA drones. At the same time, the exact command and control schema can be expected to evolve as autonomous capabilities continue to advance, and human operators gain more trust in those platforms to perform their assigned tasks.

All of this is directly intertwined with tests like Have Heat to expand what the autonomous packages for those uncrewed aircraft are capable of doing. The X-62A has been especially deeply involved in this work for years now. The aircraft itself has been receiving new upgrades specifically to expand its own autonomous and other capabilities. The Air Force’s press release on Have Heat today also touched on another recent effort called Have Holidays, which focused on rapid testing of new software and hardware. Have Heat and Have Holidays were conducted in parallel.

“HAVE HOLIDAYS saw simultaneous integration and evaluation of a wide suite of modular technologies into the X-62’s Enterprise Open Mission System Architecture computer,” according to the Air Force’s release. “This included the integration of a non-prime, third-party autonomous agent onto the X-62, testing of enhanced safety rules to prevent autonomous vehicles from violating user-established operational limits, and further chip integration for advanced sensor exploitation.”

TWZ has previously explored in detail the importance of rapid, iterative testing in the development of new AI-driven autonomous capabilities, including in the virtual realm. Lockheed Martin says that it was able to complete “full integration and ground test of the agents” used in Have Heat in just three months using its “‘Supermassive’ AI agent generation capability.”

“This system-of-systems test served as critical technical risk mitigation on the design and development of logistics and integration frameworks required to maximize flight opportunities post-MSU, paving the way for broader government, academic, and industry partnerships,” the Air Force’s release today also added.

MSU here is the larger Mission Systems Upgrades plan for the X-62A. The MSU effort is currently working toward the integration of Raytheon’s PhantomStrike radar onto the aircraft, as well as other new “sensor and computing capacity” and “modern network data communications” capabilities, per the Air Force. The addition of PhantomStrike, a lower-cost lightweight active electronically-scanned array radar, is particularly significant and will give the test jet another important boost in situational awareness, as you can read more about here.

PhantomStrike: Next generation radar superiority

“X-62 is continued proof that an agile, dedicated team can rapidly advance Department of War initiatives through intentional collaboration,” Air Force Col. Maryann Karlen, Commandant of the USAF TPS, said in a statement today. “Accomplishing these significant milestones is a direct reflection of the adaptability and warfighter focus personified by all members of the school.”

Beyond the unique VISTA aircraft, the Air Force has also been modifying six other F-16s to help support advanced autonomy work as part of Project Viper Experimentation and Next-Gen Operations Mode (VENOM). The service announced the start of actual flight testing involving Project VENOM jets last month.

The Air Force has also been making use of a variety of other crewed and uncrewed aircraft, including the aforementioned MQ-20 Avenger, to support autonomy testing and otherwise help lay the groundwork for its future CCA fleets, as well. The service has been closely coordinating with the U.S. Marine Corps and the U.S. Navy on this work, and all three services have a formal agreement to develop a common command and control architecture for future CCA-type drones. The Air Force has also been working to bring in foreign allies and partners into its CCA program, starting with the Netherlands.

The Air Force is now hoping to begin fielding its first operational CCAs by 2030. In the meantime, tests like Have Heat utilizing the X-62A and other platforms will only become more important to help build the foundation for the air combat capabilities those drones will provide on day one.

Contact the author: joe@twz.com