|Area of Operations||Worldwide|
|Enemies With||Regular Army|
|Affiliated With|| Rebel Army|
The Japanese Army (Japanese:日本軍) is Japan's official army and was a major faction during the Second Modern War.
Before the beginning of the Second Modern War and the events of Metal Slug 2, the Rebel Army offered an alliance to the Japanese Army, along with the Arabian Infantry, in order to make additional allies to take over the world with more ease. The army accepted the offer, thinking it as an opportunity to extend Japan's territory.
The Japanese Army began its activities at the same time as the Arabian Infantry. Its divisions were sent across the globe to eliminate the Regular Army's troops.
Unfortunately, because of their outdated equipment (much like the Arabians), the divisions were annihilated by the Regular troops shortly after they were sent.
The Japanese Army, now without any more active divisions, was forced to surrender to the Regular Army in order to prevent them from entering their mainland, thus terminating its ongoing invasions.
The army supposedly became neutral after its involvement in the Second Modern War, but no words were said from it since.
However, unbeknownst to most people, one of its divisions remains active somewhere in South America.
- This faction, although a participant of these, is never encountered by the player in the events of Metal Slug 2/X.
- Like the Rebel Army which was based on Nazi Germany, the Japanese Army is based on the Imperial Japanese Army. Their symbol is a crescent moon instead of the iconic rising sun.
- It is unknown why the Japanese Army is fighting overseas since Japan's current post-WWII constitution probihits the use of the Japan Self-Defense Forces (JSDF), a.k.a. Japan's de facto military, for offensive use. The JSDF is merely for defensive purposes only, though in 2015, Prime Minister Shinzo Abe made an amendment wherein the JSDF may be deployed overseas to protect their allies in a form of "collective self-defense". However, it is possible in the Metal Slug universe, some form of ultranationalistic coup occured which may have re-emerged Japan's militarism.