Marine Medium Tiltrotor Squadron 161 (VMM-161) is a United States Marine Corps helicopter squadron consisting of MV-22 Osprey transport tiltrotors. The squadron, known as the "Greyhawks", is based at Marine Corps Air Station Miramar, California and falls under the command of Marine Aircraft Group 16 (MAG-16) and the 3rd Marine Aircraft Wing (3rd MAW). The squadron has the distinction of being the first helicopter transport squadron in the world.