Service members march in international event
U.S. Army Capt. Patrick Muldoon, 52nd Fighter Wing ground liaison officer dons his ruck during the International Four Days Marches Nijmegen in Nijmegen, Netherlands, July 16, 2014. Military participants in the event had to march with a ruck that weighed a minimum of ten kilograms at all times, or face disqualification of the final award. (U.S. Air Force photo by Senior Airman Gustavo Castillo/Released)

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Photo by: Senior Airman Gustavo CastilloReleased  |  VIRIN: 140716-F-VI983-485.JPG