Behind the scenes, bioenvironmental techs keep Andersen safe Air Force Airman 1st Class An Ngo, 36th Medical Operations Squadron bioenvironmental engineering technician, sets up the Wet Bulb Global Temperature system at Andersen Air Force Base, Guam, Oct. 19, 2017. The squadron's bioenvironmental engineering flight is responsible for testing Andersen's water supply, heat index and air quality. Air Force photo by Airman 1st Class Gerald R. Willis SHARE IMAGE: Download Image: Full Size (1.71 MB) Tags: Medical Operations, Water , Bioenvironmental Engineering , CBRN, Safety, Bio Photo By: Airman 1st Class Gerald Willis VIRIN: 171019-F-FF346-1028.JPG Photo Gallery