 Based in Patuxent River, Maryland, the wing supports test and evaluation of aviation systems ranging from unmanned to rotary and fixed-wing aircraft and subsystems.It also provides aircrew, aircraft assets, maintenance support, operational and safety oversight, process and facility support for developmental flight and ground testing.Air Test and Evaluation Squadron Two One (HX-21) supports rotary-wing and tilt-rotor aircraft, unmanned aerial systems and airborne systems, including the V-22, UH-1Y, AH-1Z, CH-53K, MH-60R, and MH-60S.