U.S. Army Soldiers assigned to the 149th Transportation Company Seaport Operations Company conduct equipment confidence training in the gas chamber at Joint Base Langley-Eustis, Va., Oct. 6, 2016. The main purpose of the gas chamber training is for service members to gain confidence that their equipment will work properly and protect them from possible chemical attacks. (U.S. Air Force Photo by Airman 1st Class Derek Seifert) (Photo by Airman 1st Class Derek Seifert)