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In June 2020, The War Zone exclusively reported that one of Scaled Composites Model 401 "Son Of Ares" demonstrators had flown a number of test flights over Naval Air Weapons Center China Lake covered in a highly reflective metallic coating.
It had a similar patchwork quality to what we are seeing here on the F-22. At the time, we posited that this could be for testing advanced infrared sensors and even possible low-power laser systems and their targeting capabilities against a 'mirrored' target.
There is a tremendous amount of testing currently ongoing on infrared search and track systems (IRSTs) that are in the early processes of being widely fielded by the Air Force and the Navy, as well as developmental work on emerging aerial laser systems.
Of unique note is ongoing testing of multiple General Atomics Avenger unmanned combat air vehicles sporting Legion IRST pods that has been occurring over the Mojave Desert. These tests have been in conjunction with the Skyborg aerial artificial intelligence initiative and larger highly advanced testing scenarios.
The testing of various laser systems is also becoming extremely aggressive, as well as part of a larger push to move directed-energy concepts into an operational state. This includes laser systems intended to be fielded aboard fighter aircraft.