A U.S. Marine provides security as yellow smoke is used to signal to supporting forces during a combined arms live-fire exercise in support of exercise Cobra Gold 2012 in Muang Kom, Thailand, Feb. 15, 2012. A U.S. Marine provides security as yellow smoke is used to signal to supporting forces during a combined arms live-fire exercise in support of exercise Cobra Gold 2012 in Muang Kom, Thailand, Feb. 15, 2012. SHARE: Download: Full Size (2.9 MB) Tags: Photo Essays Credit: VIRIN: 150516-G-DWU02-634.jpg Photo Gallery