United States National Guard

From Grand Theft Wiki

The United States National Guard is involved in the Grand Theft Auto series on many occasions. They are a reserve force of the military.

San Andreas

The National Guard had its own "territory" at their own part in Ocean Docks, Los Santos. There, they stored weaponry. In the mission Robbing Uncle Sam, Ryder and CJ managed to break through the fences and steal some weapons. They were never heard of in the game since.

Liberty City Stories

They were called to investigate the destruction of Fort Staunton in Staunton Island, which they reported was due to explosions caused by weapons underground (which was actually true).