Sandbags are transported by the 633rd Civil Engineer Squadron to help prevent flooding during Hurricane Sandy, on Joint Base Langley-Eustis, 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/Airman 1st Class Teresa Aber)