Plumbers
Senior Airman Broderick Richmond, 341st Civil Engineer Squadron water and fuel systems maintenance journeyman, performs maintenance and inspects a dry-clapper valve on a fire system at Malmstrom Air Force Base, Mont., April 4, 2016. Since the beginning of this year, the maintainers have completed 280 direct scheduled work orders which included servicing routine maintenance items, emergency calls and extensive preventative maintenance. (U.S. Air Force photo/Airman Collin Schmidt)