AT4 TRAINING U.S. Marine Corps Cpl. Lloyd Burton III fires an M136E1 AT4-CS confined space light anti-armor weapon while participating in live-fire training during Exercise Ssang Yong 14 in Suesongri, South Korea, March 26, 2014. Burton is a field artillery cannoneer, assigned to 1st Battalion 12th Marines, 3D Marine Division. The annual exercise enhances interoperability between U.S. and Korean forces through amphibious operations showcasing sea-based power in the Pacific. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 492791-L-ZON71-273.jpg Photo Gallery