URBAN STRIDE U.S. Marines and Navy sailors participate in a clearing exercise in the urban terrain facility on the Marine Corps Air Ground Combat Center in Twentynine Palms, Calif., Oct. 2, 2008. The Marines and sailors are assigned to Alpha Company, 1st Battalion, 7th Marine Regiment. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 273643-I-WKR08-163.jpg Photo Gallery