service was renamed Airforce and Anti-Aircraft Command (). In 1966, this became a separate service independent from the Army, under its present name . With the prospect of a future World War 3 involving nuclear weapons, jet aircraft were purchased: 75 De Havilland Vampires in 1950, followed by over 100 De Havilland Venoms and the same number of Hawker Hunters. The Venoms served until 1983; Vampires until 1990 and Hunters even until 1994. In the late 1940s Switzerland purchased the North American P-51 Mustang from US surplus WW2 stock. The aircraft initially was intended as a stop-gap solution for the Swiss army in order to maintain a defence force during a time when the outdated Bf 109E's and Swiss built D-3801 Moranes were being phased out but the licensed production of the British designed Dh-100 Vampires and Dh-112 Venoms was not in full swing. At the end of the 1950s, reflecting both the threat of possible invasion by the Soviet Union and a nuclear warfare, Swiss military doctrine changed to mobile defence that included missions outside its territory, in order to defeat stand-off attacks and nuclear threats, including the possibility of defensive employment of air-delivered nuclear weapons. However the inability to field a force capability to carry out such missions led to the return of traditional "protection of own territory" doctrine. Meanwhile, the army started preparing ad hoc airbases in the mountains, with sections of highway strengthened to act as runways and hangars carved out of the mountains. In 1954 the first Air Radar Recruit School activated, the first early warning radar systems were installed and the concept of command & control facilities at mountain summits was introduced; leading to acquisition of the FLORIDA early warning and command guidance system in 1965 followed by the current FLORAKO system in 2003. At the same time, ground-based air defence (GBAD) projects were initiated such as radar-equipped medium-caliber guns with an integrated 63 Superfledermaus (Superbat) fire control system' as well as the BL-64 ‘Bloodhound’ air defence missile system (1964–1999). After the prototypes EFW N-20 and FFA P-16, Switzerland did not invest in development combat aircraft anymore. In 1964 the procurement of the Dassault Mirage 3 fighters (1964–2002) caused a scandal due to severe budget overruns. The commander, the chief of the general staff and the minister of defence were forced to resign, followed by a complete restructuring of the air force and air