1st Lt. Alexander J. Klink, a Paratrooper assigned to 127th Engineer Battalion, 1st Brigade Combat Team, 82nd Airborne Division lifts his arms in the air after exiting a chamber filled with CS gas, Oct. 28, 2014, at Fort Bragg, N.C. Paratroopers from...

Paratroopers assigned to 127th Engineer Battalion, 1st Brigade Combat Team, 82nd Airborne Division run in place inside a chamber filled with CS gas, Oct. 28, 2014, at Fort Bragg, N.C. Paratroopers from throughout the battalion cycled through the gas ...

Paratroopers assigned to 127th Engineer Battalion, 1st Brigade Combat Team, 82nd Airborne Division connect their drinking tubes from the M50 joint service general purpose mask to their canteens while inside a chamber filled with CS gas, Oct. 28, 2014...

Paratroopers assigned to 127th Engineer Battalion, 1st Brigade Combat Team, 82nd Airborne Division reseal their M50 joint service general purpose masks inside a chamber filled with CS gas, Oct. 28, 2014, at Fort Bragg, N.C. Paratroopers from througho...

Sgt. Osvaldo J. Vives and Spc. Jose A. Guilarte, Paratroopers assigned to 127th Engineer Battalion, 1st Brigade Combat Team, 82nd Airborne Division prepare capsules containing CS gas for a training event, Oct. 28, 2014, at Fort Bragg, N.C. Paratroope...

Paratroopers assigned to 127th Engineer Battalion, 1st Brigade Combat Team, 82nd Airborne Division react to exposure to CS gas inside a chamber, Oct. 28, 2014, at Fort Bragg, N.C. Paratroopers from throughout the battalion cycled through the gas cham...