U.S. Airmen from the 633rd Civil Engineer Squadron move sandbags to various buildings to prevent flooding in preparation for Hurricane Sandy, Langley Air Force Base, Va., Oct. 26, 2012. Due to a partnership with NASA, the 633rd CES uses the Flood Impact Analysis Tool to determine locations that need more flood protection through the use of sand bags, keeping water out of buildings. (U.S. Air Force photo by Airman 1st Class Teresa Aber)