U.S Air Force Airman 1st Class Michael Costello, 633rd Civil Engineer Squadron firefighter, and Antonio Ortiz, 633rd Civil Engineer Squadron lead firefighter, extinguish a fire during a major accident response exercise at Langley Air Force Base, Va., Sept. 22, 2011. The exercise tested and evaluated the responses to multifaceted events affecting the installation to include search and rescue, aircraft crash, hydrazine leak, nuclear munitions, mass casualty, and safety investigation scenarios. (U.S. Air Force photo by Airman 1st Camilla Griffin/Released)