Gas Attack Drill U.S. and South Korean Marines help each other during a gas attack drill as part of Korean Marine Exchange Program 15-12 at Gunha-Rhi, South Korea, Sept. 17, 2015. The U.S. and South Korean Marines practiced putting on their gas mask and carrying the simulated wounded to safety. SHARE: Download: Full Size (0.94 MB) Tags: usmc, gas mask, korea marine exchange program 15-12, gas attack, south korea, all images Credit: Cpl. Tyler Giguere VIRIN: 150917-M-LP538-003.JPG Photo Gallery