The United States O-class submarines were a class of sixteen coastal patrol submarines laid down for the United States Navy just before, and just after, the United States entry into World War I. The U
USS O-1, lead ship of her class, in dry dock, at Portsmouth Navy Yard, on 5 September 1918
USS O-13, also known as "Submarine No. 74", was one of 16 O-class submarines of the United States Navy commissioned after the end of World War I.
USS O-13 in 1918, with crew in dress whites lined up on deck