<P> China National United Front of Kampuchea </P> <Ul> <Li> Khmer Rouge </Li> <Li> Khmer Rumdo </Li> <Li> Khmer Việt Minh </Li> </Ul> <Li> Khmer Việt Minh </Li> <P> North Korea North Vietnam Pathet Lao South Vietnam </P>

When was the last time the us was in a war