missiles. Additional weapons salvaged from the four A.I. weapon bosses (Pupa, Chrysalis, Cocoon, and Peace Walker) can also be installed. ZEKE's nuclear weapon was salvaged from the remains of Peace Walker. ZEKE is a combination of AI technology built by Dr. Strangelove and the scrap parts of the game's four main bosses. Although it is AI-controlled in its testing stages, in the game's true ending shows that Paz Ortega Andrade has modified ZEKE to be manned and uses the mecha to attempt a nuclear strike on the US east coast, forcing Naked Snake to defeat her and heavily damage the unit. ZEKE is still in the MSF inventory during the events of Metal Gear Solid V: Ground Zeroes. However, when the MSF gets word of an IAEA inspection team coming to visit Mother Base, the unit and its warhead is lowered to the sea floor. The machine's fate after the destruction of MSF's Mother Base is unknown. Metal Gear EXCELSUS Appearing in Metal Gear Rising: Revengeance, Metal Gear EXCELSUS is one of the largest Metal Gears to feature in the series. The unit appears to be modeled by crabs or arachnids, with its front legs doubling as retractable blades that can alternately be used to crush or cut its way through armor, buildings, or the earth itself. It is also armed with two cannons mounted on its "head" that fire-directed bursts of super-heated plasma and have a division of Gekko units on board. The unit has a spherical cockpit that is mounted on a gyroscope; however, due to the system's limited physical control, the machine's arsenal, and its full range of movement, only nanomachine-implanted pilots can operate it. Metal Gear EXCELSUS was developed by AT Corp during 2016 after small-scale Unmanned Gears proved to be no longer effective once cyborg tech began to advance. Its name is derived from Brontosaurus excelsus, an extinct species of quadruped sauropod dinosaurs and a member of the family Diplodocidae, with "excelsus" meaning "high" or "lofty," hence its name. Unlike previous units, Metal Gear EXCELSUS was purely designed for asymmetrical warfare, capable of causing collateral damage without breaking stride. The unit possesses sheer firepower and durability at the cost of its combat capabilities. In 2018, Raiden encounters a Metal Gear EXCELSUS unit at the Shabhazabad Air Base in Pakistan, piloted by Colorado senator and presidential candidate Steven Armstrong. The mecha bore Desperado's emblem on its