So I was looking up US Code Title 18 (covers torture definitions and punishments) and I found this in section 7 (4)-see link below-concerning the jurisdiction that is covered by this part of US law.
(4) Any island, rock, or key containing deposits of guano, which may, at the discretion of the President, be considered as appertaining to the United States. What in the world is that all about?
Guano Islands Actof 1856
The Guano Islands Act was federal legislation passed by the U.S. Congress on August 18, 1856 enabling citizens of the U.S. to take possession of islands containing guano deposits. The islands could be located anywhere, so long as they were not occupied and not within the jurisdiction of other governments. It also empowered the President of the United States to use the military to protect such interests.
Whenever any citizen of the United States discovers a deposit of guano on any island, rock, or key, not within the lawful jurisdiction of any other Government, and not occupied by the citizens of any other Government, and takes peaceable possession thereof, and occupies the same, such island, rock, or key may, at the discretion of the President, be considered as appertaining to the United States. (first section of Guano Islands Act) The Guano Islands Act is currently embodied in federal statutes as U.S. Code, Title 48, Chapter 8, Sections 1411-1419.
http://en.wikipedia.org/wiki/Guano_Islands_ActApparently we took possession of Navassa Island (at least) using the Guano Islands Act
Navassa Island is a small, uninhabited island in the Caribbean Sea. It is an unincorporated territory of the United States administered by the U.S. Fish and Wildlife Service. However, Bill Warren has advanced a claim against the island (using the Guano Islands Act), and it is also claimed by Haiti.
http://en.wikipedia.org/wiki/Navassa_IslandTitle 18 section 7 (4)
http://assembler.law.cornell.edu/uscode/html/uscode18/usc_sec_18_00000007----000-.html