Two Defenders from the 51st Security Forces Squadron man a defensive fighting position during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. The field training exercise was part of the 51st SFS Combat Readiness Course, which helps enlisted Defenders of all ranks understand their role in supporting the base and maintaining the ability to “Fight Tonight.” (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)