USS ''Pioneer'' may refer to: * , a nineteenth-century barque. * USS ''Pioneer'' (1862), may refer to a scuttled Confederate States Navy submarine raised by Union troops or may refer to the

Bayou St. John submarine The Bayou St. John Confederate Submarine is an early military submarine built for use by the Confederate States of America during the American Civil War. Description The submarine is constructed of riveted iron, long, wide and deep, with a ha ...

which was for decades misidentified as the Pioneer. * , a

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

minesweeper commissioned in 1942 and sold to

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

in 1973 as ''

Leandro Valle Leandro may refer to: * Leandro (given name), a male name, including a list of people with the name * ''Ero e Leandro'', a 1707 cantata by George Frideric Handel * San Leandro, California * San Leandro Creek See also *Leandra (disambiguation) Lean ...

'' * , is an currently in service.