Andre Sanders, Buckley Fire Department assistant chief, explains the significance of having a recirculating mechanism that can be used to test fire truck pumps Dec. 20, 2017, on Buckley Air Force Base, Colorado. The recirculating mechanism prevents fire crews from having to expel hazardous foam into the environment when testing the fire truck pumps. ( Air Force photo by Senior Airman Luke W. Nowakowski)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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Keywords: afspc