sentences: "Adamant" was laid down on 31 March 1941 at Greenport, Long Island, New York, by the Greenport Basin and Construction Company as USS "Advance"; renamed "Adamant" on 17 May 1941; launched on 7 June 1941; sponsored by Mrs. Kelly Hunter, a niece of Secretary of the Treasury Henry Morgenthau, Jr.; and placed in service on 26 September 1941 at the New York Navy Yard, Lt.