The 28th Civil Engineer Squadron Airmen volunteer as casualties at the Self Aid Buddy Care (SABC) station during the Prime Base Engineer Emergency Force (BEEF) challenge at Ellsworth Air Force Base, S.D., July 22, 2016. Prime BEEF teams consist of 28th Civil Engineer Squadron personnel who are organized, equipped and trained to respond within hours to worldwide emergencies and to support the Air Force's mission with base build-up, sustainment and recovery operations. (U.S. Air Force photo by Airman Donald Knechtel)