Kinetic Kill Vehicle (KKV) force of impact alone to destroy a mock warhead outside the Earth's atmosphere. The KKV was equipped with an infrared seeker, guidance electronics and a propulsion system. Once in space, the KKV could extend a folded structure similar to an umbrella skeleton of diameter to enhance its effective cross section. This device would destroy the Minuteman RV with a closing speed of about at an altitude of more than . Further testing produced the Terminal High Altitude Area Defense (THAAD) Weapon System, the Medium Extended Air Defense System (MEADS) and the Multiple Kill Vehicle (MKV).