units to avoid friendly fire incidents. Largely due to a US embargo that prevented the purchase of further Cobras, Israel procured alternative platforms instead, including around 20 McDonnell Douglas MD 500 Defenders in late 1979. Between 1983 and 1985, by which time the embargo had been lifted, 24 new Cobras were purchased; the expanded fleet enabled the creation of a second squadron, known as the Fighting Family Squadron, on 1 June 1985. During 1990, the IAF received its first Boeing AH-64 Apache attack helicopters, having acquired a fleet of 42 by 2000. At the time of the Apache's procurement, there was considerable political controversy over the IAF's decision to overlook upgrades to its existing Cobra fleet in favour of acquiring an entirely separate model of attack helicopter. Throughout the 1980s and 1990s, the Cobras continued to play a role in major operations against groups such as Hezbollah, including Operations "Accountability" and "Grapes of Wrath", in southern Lebanon. During August 1996, the IAF's Cobra fleet was expanded yet again via 14 surplus US Army AH-1F Cobras being acquired, some of which were used by the front line squadrons while others were operated exclusively for flight training purposes. During the 2000s, the Cobra's precision strike capability was bolstered by the adoption of the Spike missile. During late 2013, Israel opted to retire the last of its 33 AH-1 Cobras from front line service, largely due to budget cuts. Its role was taken up entirely by the IAI's squadrons of AH-64 attack helicopters, while an extensive fleet of unmanned aerial vehicles (UAVs) took over the role of patrolling combat zones. The Cobra fleet was considerably older than the Apaches, which contributed to several fatal crashes of the type. The Cobras were also more expensive to maintain than UAVs and their use exposed pilots to attacks from man-portable air-defense systems operated by guerrilla groups. Around the same time frame, the IAF also pursued upgrades to its AH-64 fleet. In late 2014, Israel transferred 16 of the recently-withdrawn Cobras to the Royal Jordanian Air Force to bolster the numbers of their existing fleet. Japan Japan manufactured 89 AH-1S Cobras under license by Fuji Heavy Industries from 1984 to 2000. The type is used by the Japan Ground Self-Defense Force, and are Step 3 models, which are roughly the equivalent to the U.S. Army's AH-1Fs. The engine is the T53-K-703 turboshaft, which Kawasaki Heavy Industries produced