NASA is moving to hire a contractor to assess whether or not a Boeing 737-73W can meet its needs for a new reduced-gravity testbed aircraft. The use of planes modified for this role is now new, and they are often called “Vomit Comets” because of the extreme maneuvers they perform to simulate zero-G environments and the physical side effects this often induces. However, there’s an unusual twist here with the specific plane that NASA is now eyeing: it currently belongs to the U.S. Air Force and is part of a “classified military program.” There is a strong possibility that the aircraft in question is a mysterious 737 that the service acquired in 2020, and that has been the subject of much speculation as to its purpose ever since.

NASA’s Armstrong Flight Research Center posted a contracting notice yesterday justifying a planned sole-source contract to Denmar Technical Services, Inc. in relation to “Reduced Gravity Modification” of the 737-73W aircraft. Earlier this year, signs had already emerged that NASA might be in line to get a heavily modified and highly secretive 737 from the Air Force, designated the NT-43A and commonly referred to by the callsign RAT55. However, yesterday’s notice does not appear to refer to the NT-43A, long used as an airborne signature measurement platform and described in the past as the world’s most secretive 737, which is based on a much older 200-series airframe. We will come back to this later on.

What NASA wants now

“NASA requires Denmar Technical Services, Inc. to conduct a feasibility assessment to determine the Boeing 737-73W’s suitability to perform the NASA reduced gravity mission; modify the aircraft cabin, if required, to support reduced gravity operations; perform overdue maintenance and inspections, perform airworthiness restoration tasks, and paint the aircraft exterior with NASA identifiers,” the contracting notice NASA released yesterday explains.

The notice adds that the aircraft, if modified, would be used, at least most immediately, “for the Reduced Gravity Test Bed Project in support of the agency [sic] need for performing validation testing on Space Suits in support of the Artemis program.”

Artemis is NASA’s current effort to return U.S. astronauts to the lunar surface. The Artemis II mission, conducted in April, involved the first fly-by of the Moon by a crewed spacecraft since the end of the Apollo program in the early 1970s. However, the spacecraft did not touch down on the surface. The goal now is for a crewed lunar landing to come in 2028. RAT55 was notably used to support the launch of the Artemis II mission and the subsequent recovery of the capsule after its return to Earth.

Back in January, NASA had put out a separate contracting notice calling for information about new options to provide “parabolic flight services” to simulate “reduced gravity environments, including microgravity” for testing and scientific research purposes. The Florida-based Zero-G corporation is currently the primary provider of these services to NASA, using a retrofitted Boeing 727-200 dubbed ‘G-Force One.’ You can read more about NASA’s general use of Vomit Comets in the context of that notice here.

The Boeing 737-73W under consideration to be turned into a Vomit Comet “is owned by the United States Air Force (USAF). Denmar Technical Services, Inc. has specialized knowledge of this Boeing 737-73W aircraft as they are currently contracted by the USAF to modify the aircraft under a classified military program,” the contracting notice NASA released yesterday adds. “NASA does not have a ‘need to know’ regarding the details of the current modifications being made under the USAF contract and therefore is unable to provide modification details to another contractor or provide another contractor with access to the aircraft. The USAF will transfer ownership of the aircraft to NASA upon completion of the closeout tasks.”

“Denmar Technical Services, Inc. is uniquely positioned to close out work under their existing obligations while performing the feasibility assessment, maintenance, and any modifications required under this action,” the notice continues. “Additionally, due to the constrained timeline for the NASA Extravehicular Activity and Human Surface Mobility Program’s space suit testing for Artemis, NASA requires the assessment and overdue maintenance to be performed immediately upon contract award and any subsequent aircraft modifications to be complete no later than October 1, 2026. The timeline can only be supported if this requirement is fulfilled concurrently with the USAF closeout tasks.”

Denmar is a small aviation firm headquartered in Reno, Nevada. At the time of writing, its website lists a wide array of specialized design, modification, flight testing, and other work among its portfolios. This includes “advanced customized mission system development” that “encompasses the design of unique airborne operator interfaces, specialized emitters and sensors, system integration, and post-mission analytics and processing.” The company also describes itself as the “Nation’s leading experts on IR [infrared] and RF [radiofrequency] survivability, signature modeling, [and] agile software development for analysis and real-world operational assessments.”

In line with all this, Denmar is understood to have been the prime contractor behind the extensive modifications to RAT55. In April, the Air Force confirmed to TWZ that the NT-43A was “being transitioned to start the next phase of its career,” as reflected by its involvement in the Artemis II mission, “after decades of flights supporting the Air Force in various roles.” The aircraft, which is understood to have long called the secretive and remote Tonopah Test Range Airport (TTR) in Nevada home, has been seen much more publicly since then.

Best views of RAT55 yet. Dorsal sensor pod (EO ball) seen in detail here. Also shot inside. I wonder if this is going to be ported in full to a contractor (it is currently operated by a contractor) https://t.co/XoE1zGFN78

— Tyler Rogoway (@Aviation_Intel) April 4, 2026

However, as NASA’s recent contracting notice makes clear, the 737 it is now looking at as a potential Vomit Comet is a much newer 700-series model. TWZ has reached out to the Air Force and NASA for more information.

The curious case of N712JM

As mentioned, it is very possible, if not highly probable, that the 737 NASA is now considering turning into a Vomit Comet is one that the Air Force acquired in 2020, which TWZ explored in-depth at the time. That aircraft, which is a -73W model, is still officially on the U.S. civil register, with the registration code N712JM. Federal Aviation Administration (FAA) records show that the preceding owner of this aircraft was Denmar, which acquired it in 2019. The plane’s history before that is murky, with Boeing delivering it in 2013 to East West Bank via a trusteeship with Wells Fargo Bank, per the FAA’s records.

N712JM had drawn particular attention in 2020 not just because of its transfer to the Air Force, but also because it emerged at that time wearing a green protective coating and otherwise looking like it had just rolled off the production line. It also had some unusual external features that raised questions about its role, as we explored at the time.

In 2020, Jon Ostrower, long-time aviation journalist and editor-in-chief of The Air Current, told TWZ the following:

“This is definitely an airplane that never made it to a formal finish you’d expect from a commercial airplane. The green finish is a protective coating applied to fuselages during manufacturing to protect from scratches and other damage. It is dissolved during painting. You can also still see the manufacturing (line) number as well. That’s from its original trip down the assembly line. There’s also quite a bit of instrumentation visible with sensor wiring leading into the cabin through the passenger windows. This type of arrangement points to a flight test setup of some kind.”

In 2020, N712JM conducted many test flights in U.S. military ranges off the coast of Southern California, flying various flight profiles, some of them quite unusual. The aircraft flew those sorties from Santa Maria Airport in California, and used the callsign STING 38.

The 'mysterious' USAF Boeing 737-700 N712JM is just back to Santa Maria, Ca. after another 3+ hour flight as 'Sting 38'. https://t.co/3sxMyligwM

Seven years old yet still in 'greenie' primer, lots of sensors in odd places… Article: https://t.co/erZf3MMSwi @thewarzonewire pic.twitter.com/ivs2WQFkt4

— Airport Webcams (@AirportWebcams) June 15, 2020

What the Air Force has been using N712JM for to date is unknown. Per FAA, the aircraft has been and continues to be registered to an address at Bolling Air Force Base (technically now part of Joint Base Anacostia-Bolling) in Washington, D.C., which looks to belong to the Air Force’s Rapid Capabilities Office (RCO). The RCO has headed up multiple cutting-edge, high-priority programs over the years, including the development of the B-21 Raider stealth bomber and the X-37B reusable spaceplane. A 737-based platform could be configured to support an array of different research and development and test evaluation activities that would fall under the purview of RCO, as well as other stakeholders that this office might engage with.

There has also been some speculation over the years that N712JM might have transformed into an Air Force 737 with the serial number 21-0024, but this appears to still be unconfirmed. The 21-0024 serial has more recently become associated with other shadowy 737s tied to the U.S. military, which have civilian-style paint schemes and may also be on the U.S. civil register. One of them was notably spotted in 2025 at a U.S. forward operating location in El Salvador, sitting directly alongside an Air Force AC-130J Ghostrider gunship and a U.S. Navy P-8A Poseidon maritime patrol plane. This, in turn, raised questions about its involvement in the ongoing U.S. campaign of strikes on alleged drug smuggling boats in the Caribbean and the Eastern Pacific Ocean, as TWZ previously explored in detail.

21-0024, for reference. When I spotted it, FR24 was indeed calling it N712JM, though ADSBx had the BuNo and a different hex. https://t.co/3WwV3kxBC4

— Volgowrath (@volgowrath) April 27, 2023

Sightings and flight tracking data have also pointed to N712JM being a resident at the Sierra Nevada Corporation’s (SNC) facility at Colorado Springs Airport, in the Colorado city of the same name, over the years. SNC is well known for highly specialized and unique aircraft modification work, especially for the U.S. military, but its exact connection to this 737 is unclear.

Interestingly, there have been several online flight tracking data ‘pings’ suggesting new activity related to N712JM at Colorado Springs Airport since at least February of this year. However, there do not appear to be any confirmed flights by the aircraft from there in that same timeframe. This airport notably sits adjacent to Peterson Space Force Base.

N712JM was on again today, this time thing ping is outside the hangar but that may not be accurate https://t.co/ijkrCDLmUh pic.twitter.com/mCdJbY5OOI

— 𝗦𝗥_𝗣𝗹𝗮𝗻𝗲𝘀𝗽𝗼𝘁𝘁𝗲𝗿 (@SR_Planespotter) April 8, 2026

Are we seeing the revival of N712JM? Last ping about 2 hours ago. What will it look like? https://t.co/vnFH9W6Afw pic.twitter.com/MZSLhkwXv8

— 𝗦𝗥_𝗣𝗹𝗮𝗻𝗲𝘀𝗽𝗼𝘁𝘁𝗲𝗿 (@SR_Planespotter) March 25, 2026

There is still a possibility that NASA could be looking at a different Air Force 737-73W for possible conversion into a Vomit Comet. As the contracting notice makes clear, the aircraft in question is currently in the classified realm. At the same time, this seems far less likely to be the case given everything that is known (and still unknown) about N712JM.

A separate question does exist now as to what effort the Air Force might be in the process of closing out that would allow it to transfer any classified 737 to NASA. TWZ has previously raised tangential questions about how the Air Force might fill the resulting gaps left by the highly-specialized RAT55 moving on to the next stage of its career. It is certainly interesting in its own right that NASA seems to be focused heavily at the moment on leveraging some of the most secretive 737s in existence today to support its much less sensitive needs.

More details may emerge if Denmar deems the “classified” Air Force 737 to be a suitable starting place to create a new Vomit Comet to support NASA’s reduced gravity training needs and the Artemis program.

Update: 3:45 PM EST –

In immediate response to our queries, NASA has directed us to an additional notice about the award of the sole-source contract, valued at $8.4 million, to Denmar Technical Services back on June 1.

“The contractor will modify a Boeing 737-700 aircraft to perform lunar-gravity parabolic flights to test NASA space equipment. Once modifications are complete, NASA Armstrong will own the aircraft and oversee aircraft operations out of NASA Johnson,” the notice says. “The aircraft will be used to validate astronaut lunar suits and associated crew systems required to support Artemis mission objectives. This can be done with the modified 737 aircraft in an operationally relevant, reduced-gravity environment prior to lunar mission execution.”

No mention is made here about the sourcing of the aircraft from the Air Force or its classified mission work, as outlined in the sole-source justification that was released yesterday.

Update: 6/11/2026 –

The U.S. Air Force has provided TWZ with a brief statement about the 737-73W aircraft in question.

“The Boeing 737-73W aircraft was originally procured to serve as a flying testbed,” a spokesperson for the service said. “The program ended and [the] USAF is transitioning the aircraft to NASA.”

Contact the author: joe@twz.com

The post Is This Secretive Air Force 737 About To Become NASA’s Next ‘Vomit Comet’? (Updated) appeared first on The War Zone.

U.S. Central Command (CENTCOM) has confirmed a Saronic Corsair was the uncrewed surface vessel (USV) that rescued the crew of a U.S. Army AH-64 Apache out of the Gulf of Oman overnight. President Donald Trump has also now said Iranian forces downed the attack helicopter, and promised a response. This is the first known instance of a drone boat being used to recover personnel as part of a search and rescue mission, and has major implications for these operations going forward. Readers can otherwise get up to speed on what is already known about this incident in our initial reporting here.

“The surface drone that assisted in last night’s rescue of the Apache crew off the coast of Oman was a U.S. Navy Corsair unmanned surface vessel operated by U.S. 5th Fleet’s Task Force 59,” U.S. Navy Capt. Tim Hawkins, a CENTCOM spokesman, told TWZ. “The task force began fielding these drones in theater in late March.”

The Navy confirmed last December that it had signed an Other Transaction Authority (OTA) deal with Saronic, valued at $392 million, for the production of Corsair USVs. The Corsair, which the manufacturer also calls an autonomous surface vessel (ASV), is a 24-foot-long drone boat with a speedboat-like design that was first unveiled in 2024. The manufacturer says it has a maximum range of 1,000 nautical miles, a top speed of 35 knots, and a 1,000-pound payload capacity.

Prototype to production in under 12 months. The @Saronic OTA proves how we’ll build a hybrid manned–unmanned Fleet: open competition, real contracts, real hardware for Sailors and Marines not slides. This is now the standard. pic.twitter.com/cC9DG7jTiW

— Archive: Secretary of the Navy John C. Phelan (@SecNavPhelan) December 8, 2025

The Corsair “picked them [the Apache crew] up and transported them to another location on the water where they were then hoisted up to a helicopter for further transport,” Capt. Hawkins, the CENTCOM spokesperson, added.

CENTCOM had already confirmed to TWZ and others that an unspecified USV found and rescued the two aircrew from the downed Apache. The Wall Street Journal was first to report the specific type of drone boat employed.

The Army aviators spent approximately two hours in the water before being recovered safely, according to a previous CENTCOM statement. As mentioned, President Donald Trump has also now separately said that Iranian forces were responsible for bringing down the Apache, and that a U.S. response will be forthcoming.

Trump says that Iranian forces shot down the Army AH-64 Apache attack helicopter that went down over Hormuz yesterday.

He says that the US "must, of necessity, respond to this attack" pic.twitter.com/divKHkhgZm

— OSINTtechnical (@Osinttechnical) June 9, 2026

Since its establishment in 2021, the Navy’s Task Force 59 has been charged with helping expand the service’s operational use of uncrewed platforms, as well as artificial intelligence (AI) and machine learning-driven capabilities, across the Middle East. It has operated an array of different types of USVs, as well as uncrewed aerial systems, over the years.

How many Corsairs Task Force 59 has currently, as well as their exact configuration, is unclear. Pictures and videos that Saronic has released to date have shown Corsairs fitted out primarily for surveillance and reconnaissance missions, with a camera turret on top of a central mast-like frame. A commercial navigation radar, additional cameras to help provide extra situational awareness, and various other antennas have also been seen fitted to that frame. Saronic has talked about integrating other capabilities to enable additional mission sets, including launchers for loitering munitions, in the past.

Saronic also says Corsair has a high degree of autonomy, with the type having logged more than 100,000 nautical miles of total travel to date, including multi-day missions. The SUV is designed to be employed independently or in networked swarms, according to the company. Human operators are in the loop during these operations via datalink.

Corsair, our 24ft Autonomous Surface Vessel (ASV), has officially crossed 100,000 nautical miles traveled — that’s nearly five times around the Earth or almost halfway to the Moon!

This milestone represents more than distance. It reflects relentless testing across diverse… pic.twitter.com/opXtX6jSfO

— Saronic (@Saronic) February 23, 2026

“Corsair can be given a mission, alone or as part of a collaborative swarm, and execute with minimal human interaction to deter or counter adversarial threats at a range of 1,000 nautical miles,” Saronic said in a press release back in 2024. “Employing redundant communications and passive perception capabilities, Corsair can autonomously identify, track, follow, and intercept targets in contested and communications denied environments.”

These are all capabilities well suited to the U.S. Navy’s immediate needs in the Middle East, especially in support of the current blockade of Iranian ports. Corsair would notably offer a lower-risk way to closely shadow vessels that might be attempting a run into or out of the area. Corsair’s ability to automatically spot and track objects of interest would have helped in finding and rescuing the downed Apache crew, too. It is worth noting here that automated target detection is also a key part of Corsair’s ability to safely navigate autonomously, day or night, especially in congested waterways, as seen in the video below.

In 2025, we logged more than 79,000 nautical miles and over 15,000 hours of total operations with Corsair, our 24-ft ASV. Much of this was done on our own dime, operating 6 days a week at our test sites on the West Coast, East Coast, Gulf Coast, and beyond, allowing us to… pic.twitter.com/PZETeJia17

— Saronic (@Saronic) January 9, 2026

Corsair’s overall performance in the Middle East could easily translate to further operational use of this USV by the Navy globally. The service has particularly significant demands for persistent maritime surveillance and reconnaissance capacity, as well as just general presence, across the broad expanses of the Pacific. One of the key benefits that USVs offer is the ability to provide additional distributed ‘mass’ at relatively low cost. This can help bolster the capabilities of crewed platforms they are networked together with or just ease the operational strain on those assets.

The Navy has now also clearly demonstrated how valuable USVs could be in future maritime search-and-rescue operations worldwide. This, in turn, underscores the benefits uncrewed platforms bring to these missions, especially in the face of growing anti-air and other threats.

As we already wrote today:

“As TWZ regularly highlights, search and rescue operations present inherent complexities and risks, especially when conducted in or near hostile territory. The F-15E rescue effort in Iran put a particular spotlight on the immense risks that combat search and rescue (CSAR) forces take, with helicopters and C-130 variants sent into areas where even a high-end fighter aircraft didn’t survive.”

“Open-water recoveries can present distinct additional challenges. There is always the possibility of the loss of additional assets and personnel in the process, no matter where a CSAR mission occurs.”

“The use of a Navy drone boat in the rescue overnight highlights a new dimension for maritime CSAR going forward. These uncrewed assets can be more readily pre-positioned in a distributed manner. For example, in the broad expanse of the Pacific, USVs could be forward-deployed at multiple points along certain flight paths for this exact purpose. USVs could offer other distinct advantages in certain scenarios where they might be able to get into areas where traditional assets cannot and without risking additional personnel. These realities extend well beyond the maritime domain, and we are only likely to see uncrewed platforms of all kinds increasingly taking part in rescue efforts, especially in denied areas. The U.S. military is coming to terms with just how vulnerable their CSAR assets are and the ranges that would be needed to access highly defended areas, especially during a peer fight. Using drones to execute personnel recovery is being viewed as one part of a larger set of solutions to this pressing problem.“

The additional detail we have now that the Corsair USV brought the downed aircraft to a territorial location, where they were then hoisted into a helicopter, is notable, too. This further shows how uncrewed platforms could be used as part of a distributed hub-and-spoke-style concept of operations for future rescue missions, which could increase flexibility and total area covered. USVs could be used to penetrate into especially high-threat areas, recover personnel, and then bring them to crewed assets at safer locations to the rear, as well.

“When it comes to search and rescue, you utilize the best asset that is the closest and the quickest, and that was the case in this instance,” CENTCOM’s Hawkins also told The Wall Street Journal today. “We’ve practiced this scenario in exercises, but not quite necessarily like this.”

Corsair’s now very public use in the Middle East could be a boon for Saronic when it comes to future sales opportunities with the U.S. military and foreign customers, as well. Corsair, by itself, has already been at least evaluated by the Pentagon’s Defense Innovation Unit (DIU) under its Production-Ready, Inexpensive, Maritime Expeditionary (PRIME) effort. It was also a finalist in the Army’s xTechPacific 2025 innovation challenge.

Saronic has multiple larger USV offerings beyond Corsair, and the company just recently launched the first example of the largest type it has in development now, the Marauder. This drone boat is 180 feet long and is designed to be able to travel up to 4,100 nautical miles while carrying 150 metric tons of containerized payloads, or even further with a lighter load.

The Navy is already set to evaluate Marauder, as well as designs from six other companies, as part of the first round of prototyping under its latest Medium Unmanned Surface Vessel (MUSV) effort. This is part of a larger strategy the service rolled out in March to try to field more USVs and do so faster, as you can read more about here.

In the meantime, Saronic’s Corsair is already being employed operationally in the Middle East and demonstrating its ability to perform complex missions.

Contact the author: joe@twz.com

The post This Is The Corsair Drone Boat That Plucked The Downed Apache Crew Out Of The Gulf Of Oman appeared first on The War Zone.