Staff Sgt. Richard Gardner, 8th Security Forces Squadron 2019 Advanced Combat Skills Assessment team member, trains on clearing and breaching buildings at Kunsan Air Base, Republic of Korea, June 3, 2019. The ACSA competition challenges security forces members with hand-to-hand combatives, marksmanship, range estimation, physical fitness, land navigation and building clearing tactics. (U.S. Air Force photo by Staff Sgt. Mackenzie Mendez)