South Korean and U.S. Marines stand inside of a gas exposure training chamber during the Korean Marine Exchange Program 15-17 on the Cham Sae Mi Close-Quarters Battle Training Facility in Pohang, South Korea, Feb. 9, 2015. South Korean and U.S. Marines stand inside of a gas exposure training chamber during the Korean Marine Exchange Program 15-17 on the Cham Sae Mi Close-Quarters Battle Training Facility in Pohang, South Korea, Feb. 9, 2015. SHARE: Download: Full Size (1.76 MB) Tags: Photo Essays Credit: VIRIN: 834412-T-HIR63-613.jpg Photo Gallery