Breath of fresh air
Staff Sgt. Brian Moses, 4th Aeromedical Dental Squadron bioenvironmental technician, performs a gas mask fit test on Airman 1st Class Christopher Miller, 4th Logistics Readiness Squadron vehicle operator, at Seymour Johnson Air Force Base, N.C., Sept. 24, 2009. The test ensures proper mask fitting so no harmful agents can enter the mask and harm personnel. (U.S. Air Force photo/Senior Airman Ciara Wymbs)