Army Reserve Sgt. Vincent C. Schimke, 86th Training Division, Fort McCoy, Wis., dons and clears his protective mask during the React to Chemical or Biological Hazard Attack event of the of the 84th Training Command/11th Aviation Command/Army Reserve Careers Division Combined Command Best Warrior Competition on Fort Knox, Ky., March 30, 2015. (U.S. Army Photo by Sgt. 1st Class Clinton Wood, 84th Training Command Public Affairs)