150903-N-OQ305-008 PACIFIC OCEAN Rear Adm. Hiroshi Oka, Japanese Commander, Mine Warfare Force, arrives aboard the amphibious assault ship USS Boxer during Dawn Blitz 2015. Boxer is currently underway off the coast of Southern California participating in Dawn Blitz 2015. DB-15 is a multinational training exercise being conducted by Expeditionary Strike Group 3 and 1st Marine Expeditionary Brigade to build U.S., Japan, Mexico and New Zealand’s amphibious, and command and control capabilities through live, simulated, and constructive military training activities.