What’s in my water
Airman 1st Class Donte Arrington, 2nd Aerospace Medical Squadron Bioenvironmental engineer, fills two vials with water to test them for presence of nitrite at Barksdale Air Force Base, La., July 31, 2018. Arrington’s job requires him to take water samples around Barksdale once a week, checking every location once a month. (U.S. Air Force photo by Senior Airman Stuart Bright)