Spc. Andrew E. Toth and Pfc. Guiovanny Lopez, cavalry scouts with B Troop, 6th Squadron, 8th Cavalry Regiment, 4th Infantry Brigade Combat Team, 3rd Infantry Division, attempt to sing the “Dog-Faced Soldier Song” after removing their field protective masks in a CS gas chamber, Jan. 9, during quarterly Chemical, Biological, Radiological and Nuclear training on Fort Stewart, Ga.