Army Sgt. Luther Witherspoon determines the grid coordinate of a point on a map during night land navigation at Camp Atterbury, Ind., July 18, 2017, during Army Materiel Command's Best Warrior Competition. Witherspoon is assigned to the Army Sustainment Command. Soldiers were tested on basic and advanced warrior tasks and drills during the three-day competition. Army photo by Sgt. 1st Class Teddy Wade