During the Vietnam War, from 1964 to 1972, the RAAF contributed Caribou STOL transport aircraft as part of the RAAF Transport Flight Vietnam, later redesignated No. 35 Squadron RAAF, UH-1 Iroquois helicopters from No. 9 Squadron RAAF, and English Electric Canberra bombers from No. 2 Squadron RAAF. The Canberras flew 11,963 bombing sorties, and two aircraft were lost. One went missing during a bombing raid. The wreckage of the aircraft was recovered in April 2009, and the remains of the crew were found in late July 2009. The other was shot down by a surface-to-air missile, although both crew were rescued. They dropped 76,389 bombs and were credited with 786 enemy personnel confirmed killed and a further 3,390 estimated killed, 8,637 structures, 15,568 bunkers, 1,267 sampans and 74 bridges destroyed. RAAF transport aircraft also supported anti-communist ground forces. The UH-1 helicopters were used in many roles including medical evacuation and close air support. RAAF casualties in Vietnam included six killed in action, eight non-battle fatalities, 30 wounded in action and 30 injured. A small number of RAAF pilots also served in United States Air Force units, flying F-4 Phantom fighter-bombers or serving as forward air controllers.