Gekko

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The Gekko was a large unmanned autonomous fighting vehicle developed by AT Corp for use in ground combat. Officially designated IRVING by the United States Army, Gekko were colloquially called "lizards" after the species of small lizard with a similarly spelled name: gecko. These war machines were created using a combination of technologies used in the production of Metal Gears REX and RAY. However, Gekko were not Metal Gears. Unlike true Metal Gears, Gekko had no nuclear launch capability. Instead, they were more akin to infantry fighting vehicles, with multiple units acting as a coordinated team in support of ground forces.

A Gekko had a large mechanical turret-like head whose shape gave the impression of a face and snout. This was connected via a neck to a smaller body, at the back of which were two large, hip-like structures. Like the head, the neck, body and hips were mechanical; all were connected via mechanical joints. The joint connecting the head to the neck allowed the head to turn 360 degrees.

Both atop the head and between the hips at the front of the body was a dome-shaped sensor capable of detecting visible and infrared light and equipped with night vision and other enhanced imaging abilities, such as the ability to scan through solid objects. A Gekko also had aural sensors, enabling it to detect sound.

Attached to the hips were a pair of very strong legs with three-toed clawed feet and a single large claw on each heel. These legs, unlike the head, neck, body and hips, were biological, save for the claw on the heel. The legs were composed of artificially created muscle tissue cloned from the stem cells of ungulate embryos. Owing to this, the legs, despite largely being mechanical, strongly resembled the muscles of living organisms.[2] Gekko walked on their toes. Because each hip was connected to the body via a ball joint, a Gekko's legs had a very large range of motion. For unknown reasons, the central front area of each hip had a warning sign forbidding anyone from trying to strike at this area.

A Gekko possessed a long retractable whip-like appendage with three small manipulators on the end that could extend forward from the underside of the body to a distance of over 20 feet, allowing the Gekko to perform a wide range of tasks on the battlefield.

The engine system of the Gekko had a power output of 650HP.

Being bio-mechanical, a Gekko had a circulatory system that used blood to nourish its legs. If cut or shot, its legs would bleed. Since they were made of living muscle tissue, the legs produced lactic acid, which accumulated with muscle activity and had to be expelled periodically. Gekko did this via a release of accumulated lactic acid as a yellow-green liquid from an orifice between the hips.

Gekko communicated by lowing like cattle or chirping like cicadas; their footsteps also resemble the sound of a horse trot. If shot in the head with sufficiently high-caliber ammunition, they would squeal on the bullet's impact. Should they fall on their backs due to damaged or otherwise incapacitated legs, they would screech like wounded, frightened animals. Catastrophic damage elicited a loud groan before the unit collapsed and exploded. Gekkos were designed to replicate the sounds of these "peaceful" animals in order to cause enemy soldiers to psychologically lower their guard on the battlefield.

They also acted as carriers for Dwarf Gekko, which were a smaller, spherical, three-armed variant of the Gekko designed specifically to accomplish combat and infiltration situations that regular Gekko couldn't due to their size.