U.S. Army Sgt. 1st Class Michael Dinkel, the provost marshal noncommissioned officer in charge for 3-2 Stryker Brigade Combat Team, 7th Infantry Division, pulls perimeter security in full Mission Oriented Protective Posture gear during training at the National Training Center at Fort Irwin, Calif., Jan. 28, 2014. MOPP gear is important because it helps protects soldiers from chemical, biological, radiological and nuclear threats.