Tech. Sgt. Wes Bonin, a survival, evasion, resistance and escape instructor assigned to the 403rd Wing, Keesler Air Force Base, Miss., explains the function of a PRC-112G radio during the field portion of a combat skills training refresher course at the base marina July 18. As the base SERE specialist, Sergeant Bonin instructs more than 200 aircrew members assigned to the wing, in addition to all active duty aircrew members assigned to Keesler. (U.S. Air Force Photo by Senior Airman Kimberly Erickson)