U.S. Navy Constructionman Joseph K. Otumfuor is covered with silt from a muddy trench as he runs a 3.8 mile obstacle course at the Jungle Warfare Training Center in Okinawa, Japan, on Aug. 17, 2005. Otumfuor is assigned to Naval Mobile Construction Unit 74. DoD photo by Petty Officer 2nd Class Eric S. Powell, U.S. Navy. (Released)