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)