Soldiers of 1st Brigade Engineer Battalion, 310th Infantry Regiment, 181st Multifunctional Training Brigade, observe Soldiers of the 16th Psychological Operations Battalion, 2nd Psychological Operations Group, U.S. Army Civil Affairs and Psychological Operations Command (Airborne), react to a notional CS gas attack during the chemical, biological, radiological and nuclear defense training injects as part of Pershing Strike 21, July 19, 2021, on Fort McCoy, Wis. The 16th POB is training on Fort McCoy as part of Pershing Strike 21. (U.S. Army photo by Staff Sgt. Ryan Rayno)