 The final Royal Navy submarine to be based in Australia, HMS "Trump", was withdrawn in 1969.The first Australian "Oberon" class submarine, , was commissioned on 21 March 1967.She was followed by her sister ships; "Otway" (1968), "Ovens" (1969), "Onslow" (1969), "Orion" (1977), and "Otama" (1978).