 Complete the following phrase:  The units of the 4th Armoured Brigade were concentrated at Singleton, New South Wales, on 10 March 1943. As of April that year, the brigade formed part of the Land Headquarters Reserve. The 1st Army Tank Battalion was subsequently transferred to Caboolture in southern Queensland and reorganised as a self-supporting battalion group while remaining part of the 4th Armoured Brigade. The unit was redesignated the 1st Tank Battalion on 10 June 1943, and in August that year was shipped to Milne Bay in New Guinea. It subsequently supported the 9th Division during the 