Maj. Elisa Hammer, 779th Aeromedical Squadron Bioenvironmental Engineering Flight chief, and Staff Sgt. Jesse Ford, 779th AMDS bioenvironmental engineering technician, inspect equipment in the X-ray survey vault, May 2, 2013, at Joint Base Andrews, Md. Hammer?s team also works regularly in aircraft maintenance hangars measuring chemical exposures in fuel cells and tests airflow in ventilation systems while validating proper protective clothing and respirators. (U.S. Air Force photo by Senior Airman Steele C. G. Britton)