|Area of Operations||Worldwide|
|Enemies With||Regular Army|
|Affiliated With||Rebel Army|
The Samurai Army (Japanese: 侍軍) 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 Samurai Army, along with the Arabian Infantry, in order to make additional allies to take over the world. The Japanese Army accepted the offer, thinking it as an opportunity to extend Japan's territory.
The Samurai 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Unfortunately, because of their outdated equipment (much like the Arabians), the divisions were annihilated by the Regular troops shortly after they were sent.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 Samurai Army, now without any more active divisions, was forced to surrender to prevent the Regular troops entering their mainland and headquarters, and thus cancelling its plans.
However, unbeknownst to most people, one of its divisions remained active somewhere in South America, after witnessing a bloody fight with Regular troops.
- Like the Rebel Army which was based on Nazi Germany, the Samurai Army is based on the Imperial Japanese Army. Their symbol is a crescent moon instead of the iconic rising sun.