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TSgt. Chris Wellman and SSgt. Henry McCall perform a maintenance check on a mobile water purification system at Selfridge Air National Guard Base, Mich., as part of their duties as Water & Fuels System Maintenance specialists with the 127th Civil Engineer Squadron at Selfridge Air National Guard Base. In his civilian job, Wellman is a licensed master plumber. McCall is a full-time student in a construction management program. Both are members of the Michigan Air National Guard. (U.S. Air Force photo by John S. Swanson)
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