door. UH-1 helicopters were used in many roles including troop transport, medevac and Bushranger gunships for armed support. No. 35 Squadron and No. 5 Squadron also operated the Iroquois in various roles through the 1970s and 1980s. Between 1982 and 1986, the squadron contributed aircraft and aircrew to the Australian helicopter detachment which formed part of the Multinational Force and Observers peacekeeping force in the Sinai Peninsula, Egypt. During 1988, the RAAF began to re-equip with S-70A Blackhawks. In 1989 and 1990, the RAAF's UH-1H Iroquois were subsequently transferred to the 171st Aviation Squadron in Darwin, Northern Territory and the 5th Aviation Regiment based in Townsville, Queensland following the decision that all battlefield helicopters would be operated by the Australian Army. On 21 September 2007, the Australian Army retired the last of their Bell UH-1s. The last flight occurred in Brisbane on that day with the aircraft replaced by MRH-90 medium helicopters and Tiger armed reconnaissance helicopters. The Royal Australian Navy's 723 Squadron also operated seven UH-1B from 1964 to 1989, with three of these aircraft lost in accidents during that time. 723 Squadron deployed Iroquois aircraft and personnel as part of the Experimental Military Unit during the Vietnam War. El Salvador Numerous UH-1s were operated by the Salvadoran Air Force; during the 1980s, it became the biggest and most experienced combat helicopter force in Central and South America, fighting for over a decade during the Salvadoran Civil War and having been trained by US Army in tactics developed during the Vietnam War. By the start of 1985, El Salvador had 33 UH-1s in its inventory, some configured as gunships and others as transports; furthermore, in the following years, the country expanded its UH-1 fleet further with assistance from the US government. Several Salvadorean UH-1M and UH-1H helicopters used were modified to carry bombs instead of rocket pods. The UH-1s enabled the military to avoid ground routes vulnerable to guerilla ambushes; the gunships were typically used to suppress hostile forces ahead of troops being inserted by UH-1 transports. Germany The German aerospace company Dornier constructed 352 UH-1Ds under license between 1967 and 1981 for the West German Bundeswehr. These saw service with both the German Army and German Air Force as utility helicopters, they were also commonly used for search and rescue (SAR) missions. Having been replaced by newer twin-engined Eurocopter EC145s, the last UH-1Ds in German service were withdrawn