During World War II, US scientists created the first G.I. Robot in the hopes of replacing live soldiers in the battle field so as to reduce human casualties. The first design of the robot was nicknamed "Joe", and was programmed to follow orders. It could follow basic commands such as marching, or firing a gun, deploying a parachute etc. It also responded to military slang such as "taking cover" would make it dive down, or telling it to "open up" would make the robot open fire.
On its initial test, the G.I. Robot was sent with a soldier named Mac to destroy an enemy weapon depot on what was latter dubbed Dinosaur Island. Although Mac had misgivings about the robot and it took a while to learn how to command it properly, they succeeded in their mission and Mac began to form a bond with the robot, treating it like a fellow soldier and even going so far as to think that the robot had a personality.
Following his first successful mission, "Joe" was upgraded and given a special panel on his chest that would allow for a light beam to initiate programmed commands in the situation where a soldier is unable to verbally command the robot. This proves invaluable when Mac is sent out on another mission to Dinosaur Island with the robot to field test this new modification. Armed with his special flashlight, Mac is able to command Joe to defend him against both Dinosaurs, and the Japanese armies gigantic robot warrior when Mac is submerged in water. During the mission, Joe displays what appears to be independent action when he pushes Mac to safety, the duo eventually manage to destroy the Japanese robot, by luring it into a cave and shooting out its eyes, a feat that Joe somehow deduces on his own.
Subsequently, there are no other recorded missions involving the original G.I. Robot, the final fate of this early prototype remains unrevealed. Later on in the war, a second model G.I. Robot nicknamed Mac was briefly active with the Suicide Squad.
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