Capt. Stona Jackson, Regional Health Command-Europe,

Capt. Stona Jackson, Regional Health Command-Europe, cools off after completing a land navigation course, Sept. 18, 2018 on Camp Bullis, Texas. Jackson and his teammate, Sgt. 1st Class Steven Lockwood, were the first of their group to check in at the final check point before resting and resetting for the next scenario of the competition. The competition is a 72-hour arduous test of the teams’ physical and mental skills. (U.S. Army photo by Courtney Dock)