The Military are a group of special forces in the Grand Theft Auto series. They made their first appearance in Grand Theft Auto 2. From GTA 2 to GTA: Vice City Stories at a six star wanted level the military will attempt to kill or arrest the player they either drive in tanks or Barracks OL.
In some GTA games they have their own bases such as Fort Baxter in GTA: Vice City. In GTA: Vice City they were often portrayed as street gangs. They were never seen in GTA IV and they were replaced by the NOOSE. But they returned in GTA V in this game they don't appear during a wanted level they only appear around Fort Zancudo and if the player attempts to trespass the base they will kill the player.