Operation Crimp Westmoreland requested further reinforcement and US and allied forces increased to 44 battalions which would be used to directly bolster the ARVN. Australia's growing involvement in Vietnam reflected the American build up. In 1963, the Australian government had committed a small advisory team, known as the Australian Army Training Team Vietnam (AATTV), to help train the South Vietnamese forces. However, in June 1965 the decision to commit ground troops was made, and the 1st Battalion, Royal Australian Regiment—originally commanded by Lieutenant Colonel Ivan 'Lou' Brumfield—was dispatched. Supporting 1 RAR was 1 Troop, A Squadron, 4th/19th Prince of Wales's Light Horse
What Happened to Us the song which features Stan Walker, was released on 29 May 2011. "What Happened to Us" charted on the ARIA Singles Chart at number 14 and was certified platinum by the Australian Recording Industry Association (ARIA). An accompanying music video was directed by Mark Alston, and reminisces on a former relationship between Mauboy and Sean. "What Happened to Us" was written by Josh Alexander, Billy Steinberg, Jeremy Skaller, Rob Larow, Khaled Rohaim, Israel Cruz and Jay Sean. It was produced by Skaller, Cruz, Rohaim and Bobby Bass. The song uses C, D, and B minor chords in the chorus. "What