frame, which Armstrong used with the intention to frame Desperado for the attack, as part of his plan to ensure the war economy's revitalization and to win any subsequent election in a landslide, with his connections to the PMCs. Doktor speculates that if Armstrong's plan succeeds, "herds" of EXCELSI would be used to crush Pakistan's FATA. Raiden battles and eventually defeats EXCELSUS by ripping off one of its blades and using it to strike and destroy the Metal Gear by the head. After the battle, Armstrong exited its cockpit and used his nanomachines to engage Raiden in a long and grueling fight that further tore down the wrecked mecha. Walker Gear The Walker Gear (also known as the D-Walker) is introduced in Metal Gear Solid V: The Phantom Pain. Designed by Emmerich and mass-produced by the Soviet Army, it is a bipedal infantry support unit that serves as one of the player's modes of transport, having wheels in the legs for added speed. Walker Gears have arm manipulators for close combat, but can be equipped with small arms, Miniguns, and missile launchers for stealth and assault missions. The Walker Gear's main body is also mated to the Battle Gear, a combat support mobile weapon designed for Venom Snake and the Diamond Dogs. It moves on four maglev units and its main weapon is an electromagnetic railgun. Players can use the Battle Gear for Dispatch missions. Sahelanthropus The Sahelanthropus (also known as the ST-84 Metal Gear) is a large Metal Gear unit that appears in Metal Gear Solid V: The Phantom Pain. It is classified as an Anthropoid Bipedal Weapon System and was built by the Soviet Union in co-operation with the mysterious XOF organization. Its name is derived from Sahelanthropus tchadensis, an extinct hominine species theorised to be the last common ancestor between humans and chimpanzees as the design makes Sahelanthropus the "missing link" between the early prototypes (Shagohod and Peace Walker) and the later bipedal units (TX-55 Metal Gear and Metal Gear REX). Sahelanthropus initially appears in a crouched position with a heavily armored control unit that can be used as a battering ram against environmental hazards, but can also convert to an upright "standing" position. Its primary weapon is a tensile rod that can separate into individual whip-like threads or condense into a quarterstaff-like rod that can discharge metallic archaea—microbes that feed on minerals—into the local environment, triggering