180131-F-DB969-0043
Senior Airman William Raetz, 341st Medical Operations Squadron bioenvironmental engineering technician, holds a vial of a water sample with a chlorine reagent Jan. 31, 2018, at Malmstrom Air Force Base, Mont. Airmen from the 341st Civil Engineer Squadron environmental and 341st MDOS bioenvironmental engineering sections work together to provide monthly and quarterly water samples from multiple locations across the base and at all 15 missile alert facilities. (U.S. Air Force photo by Senior Airman Daniel Brosam)