caption: U.S. Air Force Staff Sgt. <PERSON>, 1st Maintenance Squadron Metals Technology aircraft metals technologist, selects the proper size tool for a piece of equipment at Langley Air Force Base, Va., Feb. 19, 2013. Metals technologists at Langley have also worked on air conditioning units, tire cages and even supplies for hospital construction. (U.S. Air Force photo by Senior Airman <PERSON>/Released)
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