A U.S. Army Paratrooper assigned to the 173rd Brigade Support Battalion, 173rd Airborne Brigade, fits his M50 gas mask during a live-fire exercise as part of Lipizzaner VI at Bac Range in Postojna, Slovenia, Jan. 29, 2020. Lipizzaner is a combined squad-level training exercise in preparation for platoon evaluation, and to validate battalion-level deployment procedures.