the following years, several other squadrons were also equipped with the new aircraft. The Kfir's first recorded combat action took place on 9 November 1977, during an Israeli air strike on a training camp at Tel Azia, in Lebanon. The only air victory claimed by a Kfir during its service with the IAF occurred on 27 June 1979 when a Kfir C.2 shot down a Syrian MiG-21. The IAI Kfir has been exported to Colombia, Ecuador, Sri Lanka and was leased to the US Navy and the US Marine Corps from 1985 to 1989, to act as adversary aircraft in dissimilar air combat training. Diversification In 1969 IAI acquired North American Rockwell's Jet Commander series of business aircraft. This became the basis for the IAI Westwind line. Work on an improved Westwind the Astra, by stretching the fuselage and designing a new swept wing, began in the late 1970s, with the first prototype flight on 19 March 1984. The first production Astra flew on 20 March 1985, FAA certification came on 29 August 1985 and customer deliveries started in 1986. In the 1960s, IAI developed the Gabriel anti-ship missile and the Elta Electronics Industries subsidiary developed an inexpensive aircraft radar which would become a successful export item. In the 1970s IAI developed the Dabur class patrol boat. In the 1970s IAI also entered the Unmanned aerial vehicle (UAV) market with the development of the IAI Scout. In 1984, IAI formed a joint venture with rival Israeli company Tadiran to market both companies' UAV's, the Tadiran Mastiff and the IAI Scout. Developing the maintenance, repair and overhaul business By 1980s the original Bedek maintenance business was conducting extensive overhauls on dozens of different aircraft types, working on engines as well as airframes and interiors, IAI could provide more comprehensive refurbishments than even the aircraft manufacturers themselves. The unit had 4,000 employees by the mid-1980s and overhauled a huge range of aircraft, from propeller-driven trainers to airliners; including big civil aviation programs, such as conversion of Boeing 747s to freighters. The Lavi program In 1980 the Government of Israel decided to use the experience IAI had accumulated to develop and manufacture a modern fighter plane to be the mainstay of the Israel Air Force. The aircraft, called the IAI Lavi, was to be a superior attack aircraft with advanced weapons systems. It had its rollout in July 1986 and successful maiden flight