A certain American Indian tribe contributed greatly to the U.S. military in WWII. Which tribe and what was their contribution?

Hamlet.

Navajo - used their language as a code... Nov 24 03, 9:32 AM

Doug1230

Good job, Hamlet. The Navajo language - an unwritten language of extreme complexity, and virtually unknown outside the Navajo reservation - made it the ideal "code" for military use. The Navajo "code talkers" were used in every Marine assault in the South Pacific from 1942-1945. The Japanese were baffled by the language, and never came close to cracking the code. In the Battle of Iwo Jima alone, the Navajo code talkers transmitted over 800 flawless messages, leading one Marine officer to declare that without the Navajos, the Marines would not have been able to take the island. Nov 24 03, 9:45 AM