<Li> 1 June--Advisor, Sergeant William Hacking becomes the first Australian to die in Vietnam when his weapon accidentally discharges after being caught in vegetation . </Li> <Li> 2 November--Ngô Đình Diệm, South Vietnam's first President (1955--63), and his brother, Ngô Đình Nhu, are assassinated in a successful CIA - backed coup d'état led by General Dương Văn Minh of the Army of the Republic of Vietnam (ARVN). </Li> <Li> 22 November--Lyndon B. Johnson becomes US president after the assassination of John F. Kennedy . Johnson announces that the US will continue support of South Vietnam . By the end of 1963, 15,000 US advisors are serving in Vietnam; the US gives $500 m in aid to Vietnam that year . </Li> <Tr> <Td> 1964 </Td> <Td> <Ul> <Li> 8 June--Minister for Defence announces that the Australian Army Training Team Vietnam will be increased to 83 advisers and their role will be expanded . </Li> <Li> 6 July--Warrant Officer Class Two Kevin Conway, an AATV advisor, is killed in action, the first Australian battle casualty of the war . </Li> <Li> 14 August--Six Caribou aircraft are provided by the Royal Australian Air Force; RAAF Transport Flight Vietnam is later renamed No. 35 Squadron RAAF . </Li> <Li> 10 November--Selective conscription is introduced for 20 - year - old males by ballot under the National Service Act (1964). </Li> <Li> 18 December--In response to requests from the US President and South Vietnam Prime Minister for 200 additional advisers, the Australian Government offers to send ground troops to South Vietnam . </Li> </Ul> </Td> </Tr>

When did australia join and leave the vietnam war