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-12
…USS O-12 (SS-73), also known as "Submarine No. 73", was one of 16 O-class submarines of the United States Navy commissioned during World War I. Laid up in reserve by the US Navy, in 1924, the submarine was leased for use in…
USS O-1, lead ship of her class, in dry dock, at Portsmouth Navy Yard, on 5 September 1918
Nine O-class submarines from Submarine Division 8, at Boston, 1921