Marine Corps Sgt. Derek Levi conducts pre-flight checks in a MV-22 Osprey, May 20. Levi is a crew chief with the Marine Medium Tiltrotor Squadron - 165, a Miramar, California, unit that brought their MV-22 Ospreys to the 162nd Wing’s Total Force Training Center, located at Davis-Monthan Air Force. (U.S. Air National Guard photo by Tech. Sgt. Erich B. Smith)