Airman Natalie Gaston, a 374th Medical Support Squadron bioenvironmental technician, simulates using an ADM 300, an instrument that measures radiation in the air, at Yokota Air Base, Japan, Feb. 1, 2016. Bioenvironmental engineering first responders use an ADM 300 to protect them from possible contamination while taking samples. (U.S. Air Force photo/Airman 1st Class Delano Scott)