Senior Airman Michael Mannarino, 14th Medical Operations Squadron bioenvironmental technician, uses the field HAPSITE ER Chemical Identification System June 11, 2019, on Columbus Air Force Base, Mississippi. Bioenvironmental Airmen are responsible for testing the air supply in aircraft, water, and the air on base to ensure no dangerous chemicals can contaminate the base population or harm the pilot training mission. (U.S. Air Force photo by Senior Airman Keith Holcomb)