Electro-Environmental
Senior Airman Benjamin Ledbetter, 28th Maintenance Squadron electro-environmental systems technician, places an emergency bailout oxygen bottle in an explosive proof box to test it for any problems at Ellsworth Air Force Base, S.D., July 27, 2012. The oxygen bottle is tested to ensure that if a B-1 aircrew member had to eject at extreme elevation, he or she would have oxygen to be able to breathe. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)