U.S. Air Force Staff Sgt. Johnny Glenn, aircrew flight equipment technician with the 94th Airlift Wing, Dobbins Air Reserve Base, Ga., uses an alcohol swab to clean a Quick-Don Oxygen Mask during Maple Flag in Edmonton/Cold Lake, Alberta, Canada, June 3, 2014. Maple Flag is an international exercise designed to enhance the interoperability of C-130 aircrews, maintainers and support specialists in a simulated combat environment. (U.S. Air Force photo by Master Sgt. John R. Nimmo, Sr./Released)