ELLSWORTH AIR FORCE BASE, S.D. -- (Back to front) Airmen 1st Class Julie Kemps, 28th Medical Operations Squadron flight medicine technician, and John Henry, 28 MDOS ambulance services technician, take cover in a simulated bunker while wearing mission-oriented protective posture gear during a phase II operational readiness exercise, July 21. The MOPP gear is designed to protect Airmen in case of a chemical or biological-based attack. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)