Japan asked USA for naval vessels according to the Australia Station Intelligence Summary dated 1 April 1956

An item reported that Japan asked the USA to supply under the Mutual Defence Assistance Programme (MDAP) for the fiscal year 1956 33 ships including 1-300 tons wood built coastal minesweeper, 3-250 tons L.S.S.L.’s, 15-16 tons patrol boats and 14-38 tons M.S.M.L.’s

Source

Website Royal Australian Navy, Sea Power Centre.