A 99th Airlift Squadron aircrew boards a 99th AS C-20 aircraft during a retirement ceremony at Joint Base Andrews, Md., Aug. 30, 2017. For more than three decades, the 99th AS has operated C-20s to transport the vice president, the first lady, the secretary of defense, and other high ranking officials. (U.S. Air Force photo by Airman 1st Class Valentina Lopez)