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U.S. Air Force Gen. Terrence O’Shaughnessy, Pacific Air Forces commander, and Chief Master Sgt. Anthony Johnson, Pacific Air Forces command chief, observe operations during a tour of the Central Heat and Power Plant (CHPP) during a base visit at Eielson Air Force Base, Alaska, Feb. 8, 2017. The CHPP uses about 180,000 tons of coal to provide heat and electricity for the Eielson mission and its residents year round.