U.S. Air Force Senior Airman Steven Popp, 633rd Civil Engineer Squadron entry control point monitor, covers down after a simulated chemical attack during a Phase II Operational Readiness Exercise at Langley Air Force Base, Va., April 20, 2012. Throughout the ORE, Airmen were required to perform both their jobs and additional duties while wearing mission oriented protective posture gear. (U.S. Air Force photo by Senior Airman Jarad A. Denton/Released)