
1) US island 2) US island near USSR 3) Air base near Alaska 4) Alaska outpost 5) Alaska radar station site 6) Alaska wildlife refuge site 7) Alaskan island 8) Alaskan wildlife refuge site 9) Alaskan WWII battle site 10) Aleutian base 11) Aleutian extremity 12) Aleutian island 13) Aleutian island nearest Japan
Found on
https://www.crosswordclues.com/clue/attu

(from the article `Aleutian Islands`) ...the Bering Sea (north) from the main portion of the Pacific Ocean (south) and extend in an arc southwest, then northwest, for about 1,100 miles ... ...1943. In the North Pacific, meanwhile, the United States had decided to expel the Japanese from the Aleutians. Having landed forces on Adak in ......
Found on
http://www.britannica.com/eb/a-z/a/122

the westernmost of the Aleutian Islands: Japanese occupation 1942–43.
Found on
https://www.infoplease.com/dictionary/attu
No exact match found.