Airman 1st Class Jason Parker, 81st Aerospace Medicine Squadron, Airman 1st Class Matt Sundby and Senior Airman Corbin Ortiz, 81st Medical Operations Squadron, administer medical treatment to Staff Sgt. Jeffrey Sison, 333rd Training Squadron, during a major accident response exercise March 21, 2013, at Gerrard Hall, Keesler Air Force Base, Miss. The scenario involved a leaking propane tank explosion in a supply closet that set the building on fire and injured several airmen. Keesler holds exercises periodically to prepare airmen for real-world emergencies. (U.S. Air Force photo by Kemberly Groue/Released)