icyplanetnhc (Steve)
Trekking into the cosmic ocean
Not all EMD F-22s had the matte light gray coating, and currently 4006 is the only flying aircraft that has this paint, likely because it's a flight sciences jet and not too concerned about its LO. It's also the oldest flying one. 4001's fuselage is still stored somewhere at WPAFB, 4002 and 4003 are museums, and 4004 and 4005 had production-like coatings and are also stored somewhere as maintenance trainers, I believe (not sure exactly where they are).