U.S. Marines conduct maintenance repair reinstalling the prop rotor hubs during an exercise. The MV-22 Osprey is a tiltrotor aircraft with both a vertical takeoff and landing (VTOL), and short takeoff and landing (STOL) capability. It is designed to combine the functionality of a conventional helicopter with the long-range, high-speed cruise performance of a turboprop aircraft. (read more: en.wikipedia.org/wiki/Bell_Boeing_V-22_Osprey)