In 1942–1943, the battalion took part in fighting along the Kokoda Track before returning to Australia where it spent over a year training and being rebuilt. In December 1944, the 2/3rd returned to New Guinea to take part in the Aitape–Wewak campaign and remained there until the war ended. Following the end of hostilities, the battalion was disbanded on 8 February 1946 in Brisbane. The battalion's battle honours are perpetuated by the Royal New South Wales Regiment.