SS Theodore Roosevelt was a passenger steamer built in 1906 at Toledo, Ohio, by the Toledo Shipbuilding Company, and operated commercially on Lake Michigan. Ordered taken over by the U.S. Navy on 6 April 1918 for World War I service as a troop stransport, she was acquired by the United States Navy from the Roosevelt Steamship Company sometime in the spring of 1918, assigned Identification Number (Id. No.) 1478, and fitted out as a troop transport during the summer and fall of 1918. Though some sources suggest that Theodore Roosevelt served in a non-commissioned capacity in the Navy, the fact that the 1919 Navy Directory lists Lieutenant Harry D. Irwin, USNRF, as "...comdg U.S.S. Roosevelt..." is a strong indication that she was in fact commissioned as USS Theodore Roosevelt (ID-1478) durin