FOREST PATROL U.S. Marines make their way to a compound held by members of the Guam Army National Guard, who are acting as an opposing force during the island seizure portion of the Valiant Shield 2014 exercise on Tinian’s North Field, Guam, Sept. 20, 2014. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 434891-L-ZRQ82-455.jpg Photo Gallery