U.S. Air Force Airmen from the 633rd Security Forces Squadron and 633rd Civil Engineer Squadron prepare to raise the installation colors at Langley Air Force Base, Va., following Hurricane Irene Aug. 28, 2011. Officials said the storm knocked out power to more than 4 million people and was responsible for at least 40 deaths along the East Coast. (U.S. Air Force photo by Senior Airman Jason Joel Brown)