An F-16 Fighting Falcon, tail no. 78-0038, one of the oldest remaining F-16A aircraft and still wearing markings from its time with the Diamondbacks of the 419th Fighter Wing, sits in the 309th Aerospace Maintenance and Regeneration Group open-air storage yard, Davis-Monthan Air Force Base, Arizona, on June 7, 2016. Retired F-16s are stored here for an indefinite time and are often used for spare parts, regenerated for foriegn military sales, or put back into flying status and used as QF-16 full-scale aerial targets. (U.S. Air Force photo by Alex R. Lloyd)