Airman 1st Class Kristina Di Maria, 436th Aerospace Medicine Squadron bioenvironmental engineering technician, seals a chemical suit during a fuel spill exercise April 20, 2017, at Dover Air Force Base, Del. Di Maria and other 436th AMDS bioenvironmental engineering technicians demonstrated their ability to safely work around potentially hazardous materials during the exercise. (U.S. Air Force photo by Senior Airman Aaron J. Jenne)