Col. Trent Edwards, 28th Mission Support Group commander, shovels snow in front of an unoccupied house in base housing on Ellsworth Air Force Base, S.D., March 9, 2011. Colonel Edwards encourages base housing occupants to focus on community safety by clearing snow on adjacent sidewalks within 24 hours after a snowfall. (U.S. Air Force photo/Staff Sgt. Marc I. Lane)