<Tr> <Td> <P> Anti-Communist forces: </P> South Vietnam United States South Korea Australia New Zealand Kingdom of Laos Republic of China </Td> <Td> <P> Communist forces: </P> North Vietnam Viet Cong Pathet Lao People's Republic of China Soviet Union North Korea </Td> </Tr> <P> Anti-Communist forces: </P> <P> Communist forces: </P> <Tr> <Th_colspan="2"> Strength </Th> </Tr>

Who sent the first combat troops to vietnam