ELLSWORTH AIR FORCE BASE, S.D. -- (Left) Senior Airman David Brock, 28th Security Forces Squadron Airman, checks identification on Master Sgt. Katherine Proffit, 28 SFS Airman, during a Phase II Operational Readiness Exercise while in mission oriented protective posture gear, May 11. The exercise is a simulated deployment which tests Airmen on their skills and abilities while under stressful conditions. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)