It's Official: F-35s Are Now Being Delivered Without Radars

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It’s Official: F-35s Are Now Being Delivered Without Radars

Delays in the delivery of new AN/APG-85 radars are deeply intertwined with other woes that continue to hound the F-35 program.

By Joseph Trevithick

Published

Jun 26, 2026 2:41 PM EDT

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A stock picture of a row of US Marine Corps F-35B Joint Strike Fighters.

USMC

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The U.S. military has now confirmed the acceptance of at least six F-35 Joint Strike Fighters for the U.S. Marine Corps without radars. This is due to issues tied to the development of the new AN/APG-85 radar, the first production lot of which is scheduled to be delivered in 2028. The prospect of radarless F-35s had first emerged publicly back in February. The AN/APG-85 is a critical component of the larger Block 4 upgrade package for all variants of the F-35, an effort that has been mired in cost growth and delays.

Marine Corps Lt. Gen. Gregory Masiello, head of the F-35 Joint Program Office (JPO), disclosed the acceptance of the six radarless F-35Bs at a hearing before members of the Senate Armed Services Committee earlier this week. This came as part of a larger back-and-forth between Masiello and Senator Mark Kelly, an Arizona Democrat and a retired naval aviator, about F-35 readiness rates across the U.S. Air Force, Marine Corps, and Navy, which have long been a point of concern.

Two weeks ago, the Government Accountability Office (GAO), a Congressional watchdog, released a report stating that the average F-35 full mission capable (FMC) rate across all variants had fallen from 38 to 25 percent between Fiscal Years 2020 and 2025. GAO defines FMC as an aircraft "that can perform all of its missions." The F-35 JPO has not disputed GAO’s figures directly, but has openly disagreed with the methodology it uses to determine FMC.

The full breakdown of Full Mission Capable (FMC) readiness rates between Fiscal Years 2020 and 2025 for all F-35 variants included the report GAO released two weeks ago. GAO

"So, the GAO FMC rate is, they said, 25 percent. Your office claims it’s 56 percent," Kelly said, leading up to his question. "We’ll go with your number, 50 percent. So, half of the airplanes are not fully mission capable, and I think it’s the Marine Corps that has been accepting airplanes with no radar in it. Is that correct?"

"We have accepted six aircraft for the Marine Corps that do not have a radar installed. That is correct," Masiello confirmed.

Kelly then asked if this was due to a lack of available AN/APG-85 radars, which Masiello also confirmed.

Reports circulating already say that the aircraft in question are reportedly short takeoff and vertical landing-capable F-35Bs, though Masiello does not appear to have confirmed this during the hearing. The Marines are the only U.S. operator of the B variant, but they also fly carrier-based C models.

US Marine Corps F-35Bs. USMC

A US Marine Corps F-35C seen on the deck of the US Navy’s Nimitz class aircraft carrier USS Abraham Lincoln. CENTCOM

"The Block 4 modernization program is necessary to ensure that the Marine Corps and Joint Force can continue to project air superiority against future threats," a Marine Corps spokesperson told TWZ today when asked for more information. "The Department of War deliberately undertook a highly concurrent development and production program for Block 4 capabilities (Technical Refresh 3 (TR-3), APG-85, etc.) and the largest fighter aircraft production line in the world. DoW officials made this decision with full understanding of the risk of having production aircraft ready ahead of the Block 4 capabilities. The Services’ decision ensured that production aircraft could accept Block 4 capabilities, rather than continuing to build Block 3 F-35s that would require extensive retrofit for Block 4 capabilities, thereby saving multiple years of retrofit hardware installation. "

The Marine Corps deferred any further questions to the F-35 JPO. TWZ had already reached out to that office for more information, as well.

"F-35 Lightning II aircraft are being built to accommodate the F-35 advanced radar (APG-85) for U.S....