Washington, Feb. 4 -- The United States and Japan are holding a joint military exercise that for the first time identifies China as their hypothetical enemy, Japanese news agency Kyodo reported on Sunday.

This year's edition of bilateral command-post Exercise Keen Edge utilizes unaltered maps of China, in a break with tradition that had the allies use maps with altered topography to avoid backlash in the event the plans were leaked, government sources told the news agency.

The exercise is being held from February 1-8 and will be followed up by live-action Exercise Keen Sword around 2025, which will reportedly factor in the results of the computer-simulated command-post drills to verify their efficacy.

Yoshihide Yoshida, chief of the Japa...