Staff Sgt. Andrew Lieffring, left, and Senior Airman Mike Florhaug, right, 133rd Maintenance Squadron, work jointly to upgrade a New Generation Heater in St. Paul, Minn., May 17, 2013. (U.S. Air Force photo by Tech. Sgt. Amy M. Lovgren/Released)
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ST. PAUL, MN, US
This work, Team work [Image 1 of 4], by TSgt Amy Lovgren, identified by DVIDS, is free of known copyright restrictions under U.S. copyright law.