Staff Sgt. Matthew Auger, 28th Civil Engineer Squadron heating, ventilation and air conditioning technician, mans an entry control point during an operational readiness exercise at Camp Lancer on Ellsworth Air Force Base, S.D., March 30, 2015. OREs are designed to prepare and train Airmen for real-world contingencies in a deployed environment. (U.S. Air Force photo by Airman 1st Class Rebecca Imwalle/ Released)