U.S. Air Force Tech. Sgt. Christopher Stahl, Air Combat Command, Heritage of America Band bassoonist, dons a gas mask and checks seal during the German Armed Forces Badge for military Proficiency event at Joint Base Langley-Eustis, Va., Nov. 2, 2016. The GAFPB includes a pass or fail nuclear, biological, chemical evaluation of donning a protective mask within nine seconds. (U.S. Air Force photo/Tech Sgt. Daylena S. Ricks)
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