CAMP LEJEUNE, N.C. (Jan. 28, 2021) Marine Corps Lance Cpl. Conner Russel, a chemical, biological, radiological and nuclear specialist with Chemical, Biological, Radiological and Nuclear Defense Unit (CBRN), 2d Marine Division, administers a O-Chlorobenzylidene malononitrile (CS Gas) canister to Marines during an Individual Protective Equipment Confidence Exercise on Camp Lejeune, N.C., Jan. 28, 2021. The Marines rehearse donning and clearing their M50 Joint Service General Purpose Masks in a contaminated environment, and received instructions on how to react after a notional CBRN attack in the field. (U.S. Marine Corps photo by Cpl. Elijah J. Abernathy)