U.S. Airmen seek shelter inside an instructor bay at the weather complex for a tornado warning during a hurricane exercise April 24, 2013, at Keesler Air Force Base, Miss. Throughout the exercise, "Hurricane Hana" brought severe thunderstorms, F2 tornado strength winds, rain and hail damage to several base facilities. The purpose of the exercise was to prepare Keesler for the upcoming hurricane season. (U.S. Air Force photo by Kemberly Groue/Released)