Defenders hone combat readiness

U.S. Air Force Airman 1st Class Alexander Choi, 51st Security Forces Squadron turret gunner, prepares an M240 machine gun during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. The field training exercise was one of the final parts of the 51st SFS Combat Readiness Course, where Defenders spend 10 days expanding their knowledge on defending the base, executing contingency operations and sustaining the force. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

U.S. Air Force Airman 1st Class Alexander Choi, 51st Security Forces Squadron turret gunner, prepares an M240 machine gun during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. The field training exercise was one of the final parts of the 51st SFS Combat Readiness Course, where Defenders spend 10 days expanding their knowledge on defending the base, executing contingency operations and sustaining the force. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

U.S. Air Force Staff Sgt. Prince Johnson, 51st Security Forces Squadron Defender, dons his gas mask during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. Johnson was part of a group of Defenders who went through the 51st SFS Combat Readiness Course, a 10-day program that covers basic and advanced contingency operations and base-specific defense tactics, including the use of Mission Oriented Protective Posture gear. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

U.S. Air Force Staff Sgt. Prince Johnson, 51st Security Forces Squadron Defender, dons his gas mask during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. Johnson was part of a group of Defenders who went through the 51st SFS Combat Readiness Course, a 10-day program that covers basic and advanced contingency operations and base-specific defense tactics, including the use of Mission Oriented Protective Posture gear. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

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)

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)

Defenders from the 51st Security Forces Squadron settle into 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)

Defenders from the 51st Security Forces Squadron settle into 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)

Military working dog handlers from the 51st Security Forces Squadron take a pause with their canine partners 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, a 10-day program that covers basic and advanced contingency operations and base-specific defense tactics, including the use of Mission Oriented Protective Posture gear. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

Military working dog handlers from the 51st Security Forces Squadron take a pause with their canine partners 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, a 10-day program that covers basic and advanced contingency operations and base-specific defense tactics, including the use of Mission Oriented Protective Posture gear. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

U.S. Air Force Airman 1st Class Alexander Choi, 51st Security Forces Squadron turret gunner, test fires several blank rounds from an M240 machine gun during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. The field training exercise was one of the final parts of the 51st SFS Combat Readiness Course, where Defenders spend 10 days expanding their knowledge on defending the base, executing contingency operations and sustaining the force. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

U.S. Air Force Airman 1st Class Alexander Choi, 51st Security Forces Squadron turret gunner, test fires several blank rounds from an M240 machine gun during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. The field training exercise was one of the final parts of the 51st SFS Combat Readiness Course, where Defenders spend 10 days expanding their knowledge on defending the base, executing contingency operations and sustaining the force. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

A Defender from the 51st Security Forces Squadron loads an M240 machine gun ammo pouch during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. The field training exercise was one of the final parts of the 51st SFS Combat Readiness Course, where Defenders spend 10 days expanding their knowledge on defending the base, executing contingency operations and sustaining the force. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

A Defender from the 51st Security Forces Squadron loads an M240 machine gun ammo pouch during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. The field training exercise was one of the final parts of the 51st SFS Combat Readiness Course, where Defenders spend 10 days expanding their knowledge on defending the base, executing contingency operations and sustaining the force. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)

OSAN AIR BASE, Republic of Korea -- U.S. Air Force Airman 1st Class Alexander Choi, 51st Security Forces Squadron turret gunner, prepares an M240 machine gun during a field training exercise at Osan Air Base, Republic of Korea, March 23, 2017. The field training exercise was one of the final parts of the 51st SFS Combat Readiness Course, where Defenders spend 10 days expanding their knowledge on defending the base, executing contingency operations and sustaining the force. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)