A U.S. Marine with 2nd Battalion, 1st Marine Regiment, provides overwatch during an integrated squad exercise with Mexican marines assigned to the Amphibious Marine Infantry Brigade as they navigate the infantry immersion trainer during Rim of the Pacific exercise at Marine Corps Base Camp Pendleton, California, July 9, 2018. The IIT provided the Marines with “hands on” practical application of tactical skills and decision making in an immersive, scenario-based training environment. RIMPAC demonstrates the value of amphibious forces and provides high-value training for task-organized, highly capable Marine Air-Ground Task Forces enhancing the critical crisis response capability of U.S. forces and partners globally. Twenty-five nations, 46 ships, five submarines, about 200 aircraft and 25,000 personnel are participating in RIMPAC from June 27 to Aug. 2 in and around the Hawaiian Islands and Southern California. - A U.S. Marine with 2nd Battalion, 1st Marine Regiment, provides overwatch during an integrated squad exercise with Mexican marines assigned to the Amphibious Marine Infantry Brigade as they navigate the infantry immersion trainer during Rim of the Pacific exercise at Marine Corps Base Camp Pendleton, California, July 9, 2018. The IIT provided the Marines with “hands on” practical application of tactical skills and decision making in an immersive, scenario-based training environment. RIMPAC demonstrates the value of amphibious forces and provides high-value training for task-organized, highly capable Marine Air-Ground Task Forces enhancing the critical crisis response capability of U.S. forces and partners globally. Twenty-five nations, 46 ships, five submarines, about 200 aircraft and 25,000 personnel are participating in RIMPAC from June 27 to Aug. 2 in and around the Hawaiian Islands and Southern California.