ELLSWORTH AIR FORCE BASE, S.D. – Airman 1st Class John Henry, 28th Medical Operations Squadron ambulance services technician, waits out a simulated chemical attack while in mission-oriented protective posture gear during a phase II operational readiness exercise, July 21. A phase II ORE is designed to prepare Airmen for deployed operations, including potential chemical attacks. (U.S. Air Force photo/Airman 1st Class Corey Hook)