U.S. Air Force Staff Sgt. Kristine Mackeown, 633rd Air Base Wing Chapel chaplain assistant, takes cover during a simulated missile attack during the phase II operational readiness exercise at Langley Air Force Base, Va., Feb. 15, 2012. A phase II ORE is designed to prepare Airmen for deployed operations, including potential chemical attacks. (U.S. Air Force photo by Airman 1st Class Teresa Cleveland/Released)