Airman 1st Class Brendan Saad, 341st Operational Medical Readiness Squadron bioenvironmental engineer apprentice, prepares a water sampling test April 5, 2021, at Malmstrom Air Force Base, Mont. In addition to checking water purity, bioenvironmental engineers monitor air quality, ventilation systems and different chemicals Airmen may be exposed to while completing their mission. (U.S. Air Force photo by Senior Airman Jacob M. Thompson)