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The Walking Gun in action.

The Walking Gun is a weapon used by the Unknown Alien Species during the Invasion of Earth and is more of an infantry support weapon than an actual vehicle. The Walking Gun fires 16 small, guided missiles at a single target in order to destroy cover. While the gun is generally well-armored, the joints is able to temporarily stagger one, although the pulse jet engines at the rear of the machine are able to right it within a minute. Each walking gun is presumably operated by one of the Intel Caste members, as they are the only ones with two grasping hands. The guns are used to support both Operations and General Infantry during a battle.

During the battle in Los Angeles, only one Walking Gun was witnessed in combat as the invaders clashed with US  Marines on Interstate 10. It decimated the Marines until its' destruction by Martinez, who gave his own life to destroy it.