The Australian Government’s involvement in South Vietnam was undertaken as a war of choice, driven by the desire to maintain the ANZUS alliance and keep America engaged in the defence of South-East Asia. While Menzies justified the Australian deployment in South Vietnam as responding to a direct threat to Australia from China, there was no Australian military assessment to support such an assertion. Since Australian national sovereignty was not at risk, the conflict did not require the significant economic and manpower commitments typically associated with the Second World War. Indeed, keeping the Australian commitment to the Vietnam War limited was the primary and recurrent aim of government policy. For defence planners and politicians alike, there was little other guidance, as the conflict suffered from a clear lack of aims in both Washington, DC and Canberra.