U.S. Airmen assigned to the 20th Equipment Maintenance Squadron armament flight perform inspections on numerous M61A1 Vulcan 20 mm rotary cannon parts at Shaw Air Force Base, S.C., Aug. 2, 2018. The inspections occur every 18 months and take approximately 31 hours to complete. These inspections help the 20th Fighter Wing in completing its suppression of enemy air defenses mission. (U.S. Air Force photo by Senior Airman Christopher Maldonado)