Rows of retired U.S. military aircraft sit in open-air storage at Davis-Monthan Air Force Base, Arizona, home of the military's aircraft 'boneyard.' Stenciled storage codes mark each airframe for inventory. Many Vietnam-era aircraft were flown here at the end of their service lives for long-term storage, parts reclamation, or eventual scrapping — the arid climate ideal for preserving airframes for years or decades. Project: 219023