U.S. Army Sgt. 1st Class Joaquin Spikes, assigned to the U.S. Army Security Assistance Command, securely straps his gas mask during a chemical, biological, radiological and nuclear scenario as part of the 2017 Army Materiel Command's Best Warrior Competition July 17, 2017, at Camp Atterbury, Indiana.
During the three-day competition, these elite warriors are test on basic and advanced warrior tasks and drills. (U.S. Army photo by Sgt. 1st Class Teddy Wade) Original public domain image from Flickr