Originally SS Saluda, the ship was built in 1918-1919 and acquired by the Navy in 1921.

The first retained her mercantile name when acquired by the Navy; the latter two were named for the capital of Puerto Rico.

Acquired by the Navy on 21 October 1947 she was designated Mission Carmel (AO-113) and assigned to the Naval Transportation Service for operations.

USS Helenita (YP-2230), a small wooden motor boat acquired by the Navy in 1919.

USS Sacagawea (YT-326), was a tugboat, acquired by the Navy and renamed in 1942, and struck in 1945.

Acquired by the Navy on 21 November 1947 she was retransferred to the Naval Transportation Service the same date.

SS Southern Cross operated in the South American trade from 1921 until acquired by the Navy from the Maritime Commission on 8 November 1939.

Acquired by the Navy on 24 October 1947 she was placed in service with the Naval Transportation Service as Mission Los Angeles (AO-117).

Vida was offered to and acquired by the Navy, 15 January 1942.

SS America was moored at Norfolk, Virginia, and acquired by the Navy on June 1, 1941 to be used as a troop transport.