REX Metal Gear REX is an entirely different Metal Gear model that appears in Metal Gear Solid designed by Yoji Shinkawa. Unlike previous Metal Gears, its legs are heavily armored and reinforced. Metal Gear REX has near-impenetrable compound armor, a pair of 30 mm gatling guns, anti-tank missiles, and a free-electron laser, to protect itself from conventional forces. Its primary weapon, however, is a magnetic railgun capable of delivering an untraceable nuclear warhead anywhere in the world, without the propellant trail or launch flare that gives away the launch position of a traditional ballistic missile. It also possessed a radome, a satellite antenna-shaped object on REX's left side that provides information about the environment outside of the cockpit while keeping the pilot safe from harm, and increasing the accuracy of all weapons as well. Destroying the radome is crucial to rendering the virtual reality interface useless and forcing the pilot to manually control REX. The pilot is also forced to expose himself to enemy fire, by opening the cockpit in order to see outside (a weakness deliberately built into REX as a "character flaw"). The story of Metal Gear Solid shows weapons company ArmsTech president Kenneth Baker bribes DARPA chief Donald Anderson to get covert U.S. Government funding for Metal Gear REX's development for the U.S. Army, and sends the single prototype to be tested at a nuclear weapons disposal facility on Shadow Moses Island. However, the Shadow Moses facility is taken over by rogue special forces unit FOXHOUND attempting to use REX as leverage to extort the U.S. Government. Solid Snake comes out of retirement and infiltrates the Shadow Moses facility in order to find out about REX. Liquid Snake and Revolver Ocelot intend to use REX to hold the world hostage. Later, Liquid uses REX to fight Snake. Snake, with the help of engineer Dr. Hal Emmerich and the Cyborg Ninja, eliminates FOXHOUND and destroys the mecha. Metal Gear Solid 2: Sons of Liberty reveals that Metal Gear REX's battle data were sold on the black market and Metal Gear variants spread worldwide; in response, Metal Gear RAY is designed to combat these variants and render them useless. In the prequels, Metal Gear REX is seen in Metal Gear Solid 3: Snake Eater as Dr. Aleksandr Granin's original blueprints that are shown to Naked Snake which are later stolen by Ocelot, and seen in Metal Gear Solid: Portable