A drill instructor with Charlie Company, 1st Recruit Training Battalion, conducts chemical, biological, radiological, nuclear (CBRN) defense training at Marine Corps Recruit Depot, Parris Island, S.C., June 24, 2019. Training for CBRN defense is an event that recruits must complete in order to become United States Marines. (U.S. Marine Corps photo by Lance Cpl. Ryan Hageali/Released)
{}