The first liquid-propellant DF-3 medium-range ballistic missile was successfully launched from the Northern Missile Test Site on December 18, 1968, inaugurating the test site. In August 1969, the development of China's first heavy-lift satellite launch vehicle (SLV), the Feng Bao 1 (FB-1) (风暴一号, was started by Shanghai's 2nd Bureau of Mechanic-Electrical Industry. The all-liquid two-stage launcher was derived from the DF-5 ICBM. Only a few months later, a parallel heavy-lift SLV program, also based on the same DF-5 ICBM and known as CZ-2, was started in Beijing by the First Space Academy. The DF-4 was used to develop the Long March-1 SLV. A newly designed spin-up orbital insertion solid-propellant rocket motor third stage was added to the two existing Nitric acid/UDMH liquid propellant stages. An attempt to use this vehicle to launch a Chinese satellite before Japan's first attempt ended in failure on November 16, 1969. The first DF-4 liquid-propellant with two-stage, single-warhead IRBM was tested with success on January 30, 1970. The addition of a second-stage allowed the missile to increase its range to over 4750 km.