Personnel at Joint Base Andrews, Md., de-ice C-17 Globemaster III aircraft on the flightline, March 25, 2013, during a spring snowstorm. (U.S. Air Force photo/Staff Sgt. Brittany E. Jones)

Three KC-135 Stratotankers from the 459th Air Refueling Wing sit on a snow-covered flightline on Joint Base Andrews, Md., after a snowstorm, March 25, 2013. The spring snowstorm was forecasted to bring up to five inches of snow to the local area.(U.S. Air Force photo/ Staff Sgt. Katie Spencer)

A staff sergeant walks towards a C-17 Globemaster III aircraft on the flightline at Joint Base Andrews, Md., March 25, 2013, during a spring snowstorm. (U.S. Air Force photo/Staff Sgt. Brittany E. Jones)

Tech. Sgt. Matthew Cain, 459th Aircraft Maintenance Squadron crew chief, dusts snow off a generator March 25, 2013 at Joint Base Andrews, Md. Despite the spring snowfall, which is forecasted to bring up to five inches of snow to the area, JBA service members must still perform their mission essential duties. (U.S. Air Force photo/Airman 1st Class Erin O’Shea)

Personnel at Joint Base Andrews, Md., continue flightline operations, March 25, 2013, despite a spring snowstorm forecasted to bring up to five inches of snow to the area. (U.S. Air Force photo/Staff Sgt. Brittany E. Jones)

Tech. Sgt. Matthew Cain, 459th Aircraft Maintenance Squadron crew chief, conducts a preflight checklist on a KC-135 Stratotanker, March 25, 2013 at Joint Base Andrews, Md. During inclimate weather conditions, maintainers take extra precautions when working on the flightline. (U.S. Air Force photo/Airman 1st Class Erin O’Shea)

Personnel clear snow from the sidewalk at Joint Base Andrews, Md., March 25, 2013. The spring snowstorm is forecasted to bring up to five inches of snow to the local area. (U.S. Air Force photo/Staff Sgt. Nichelle Anderson)