MINOT AIR FORCE BASE, N.D. -- A construction worker works to install a ground source heat pump in the 5th Bomb Wing headquarters building here Dec. 15. The 5th Bomb Wing headquarters building is currently undergoing construction to utilize geothermal heating by having 39 ground source heat pumps installed in the building along with 30 geothermal wells on the west side of the building. (U.S. Air Force photo by Staff Sgt. Keith Ballard)
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