ELLSWORTH AIR FORCE BASE, S.D. - Airmen from the 28th Civil Engineer Squadron take cover inside a bunker during a Phase II Operational Readiness Inspection, Oct. 15. The Airmen were in the bunker to protect themselves from simulated gun fire during an attack by oppositional forces. The ORI was designed to test the overall effectiveness of the 28th Bomb Wing in a deployed environment. (U.S. Air Force photo/Staff Sgt. Marc I. Lane)