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Shingo Matsumura, a 35th Civil Engineer Squadron boiler operator, looks through a steam plant maintenance book at Misawa Air Base, Japan, Jan. 30, 2017. The maintenance book includes blueprints for the boiler rooms and instructions for performing all maintenance checks. Misawa holds 11 different steam plants across the base. (U.S. Air Force photo by Airman 1st Class Sadie Colbert)
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