U.S. Air Force Brig. Gen. Mark Kelly, 354th Fighter Wing commander, looks at the traveling grate of a boiler during a tour of the central heat and power plant Oct. 15, 2013, Eielson Air Force Base, Alaska. Fuel is fed into the traveling grate and burned to make steam for Eielson’s electrical and heat requirements. (U.S. Air Force photo by Senior Airman Joshua Turner/Released)
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