Japanese Ground Self-Defense Force scout swimmers emerge out of the water and sight in on their rifles during the Japanese Observer Exchange Program April 28, 2015 at Kin Blue. JOEP is a III Marine Expeditionary Force, 31st Marine Expeditionary Unit and JGSDF coordinated program designed to increase regional security, maintain unit readiness and enhance overall cooperation. This is the fourth iteration of JOEP for the 31st MEU after the initial partnership in September 2012. (U.S. Marine Corps photo by Cpl. Ryan C. Mains/Released) - Japanese Ground Self-Defense Force scout swimmers emerge out of the water and sight in on their rifles during the Japanese Observer Exchange Program April 28, 2015 at Kin Blue. JOEP is a III Marine Expeditionary Force, 31st Marine Expeditionary Unit and JGSDF coordinated program designed to increase regional security, maintain unit readiness and enhance overall cooperation. This is the fourth iteration of JOEP for the 31st MEU after the initial partnership in September 2012. (U.S. Marine Corps photo by Cpl. Ryan C. Mains/Released)