 Following America's entry into World War I, "Machigonne" was acquired by the U.S. Navy on 2 October 1917 under charter, and commissioned 15 May 1918 as USS "Machigonne" (SP-1043).During the war, the ship was armed with two one-pounder guns for defense, and used to transport men and supplies between Boston and Bumpkin Island Training Station.After the end of hostilities, USS "Machigonne" was decommissioned and resumed commercial service.