1) American nuclear test site 
(from the article `Rat Islands`) ...group of the Aleutian Islands, southwestern Alaska, U.S. They extend about 110 miles (175 km) southeast of the Near Islands and west of the ...
an island off the coast of SW Alaska, in the W part of the Aleutian Islands: site of U.S. air base during World War II. 40 mi. (64 km) long.