Airmen from the 22nd Maintenance Group secure a KC-135 Stratotanker after hearing an attack warning signal during the operational readiness exercise Sept. 10, 2011, McConnell Air Force Base, Kan. Standardized attack warning signals are used to warn of attacks, initiate post-attack recovery actions and return the airbase to a wartime state of readiness. (U.S. Air Force photo by Senior Airman Maria A. Ruiz)
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