This is what a joint US Marine-Japanese training exercise looks like
Military planners spend years putting training exercises together and the political ramifications can be steep, such as with the annual Foal Eagle exercise on the Korean Peninsula. North Korea has a history of shelling South Korean islands and firing missiles into the Sea of Japan whenever the U.S. and South Korea come together to train. Calling them "maneuvers" or "war games" is an oversimplification. The long-term consequences could be life or death.