Shingo Matusmura, a 35th Civil Engineer Squadron boiler operator, checks the back of a boiler at Misawa Air Base, Japan, Jan. 30, 2017. The steam operations shop, comprised of contractors who perform maintenance checks throughout the day, is overseen by the 35th CES. Every shift, five personnel must be present to ensure continuity and safety of the larger heating systems. (U.S. Air Force photo by Airman 1st Class Sadie Colbert)