JOHNSTON, IA, UNITED STATES

Billed as “50 teams, 50 hours, 50 miles,” the U.S. Army’s 11th annual Best Sapper Competition tests combat engineers in a variety of technical and physical challenges April 25-27 at Fort Leonard Wood, Mo. Here competitors, including Team 35 from the Iowa Army National Guard, prepare to carry a 350-pound Zodiac boat to the Big Piney River, so they can paddle downstream to their next event. (Contributed photo courtesy of Fort Leonard Wood)

Courtesy of DVIDS