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A M61A1 20mm Gatling Gun sits on a stand while U.S. Air Force Senior Airman Joshua Wood and Airman 1st Class John Williams, both 35th Maintenance Squadron armament technicians, work on breach bolts at Kunsan Air Base, Republic of Korea, May 15, 2017. Breach bolts pulls the round into the rotor, pulling it forward so it can fire then pulls it back. This was a part of an 18-month inspection where they completely break down the M61A1 20mm Gatling Gun and rebuild it, repairing or replacing any components that have been damaged.