I found this info under the following link:
http://www.runningdeeslonghouse.com/webdoc32.htm
During World War II more than 44,000 Native Americans saw military service. They served on all fronts in the conflict and were honored by recieving numerous Purple Hearts, Air Medals, Distinguished Flying Crosses, Bronze Stars, Silver Stars, Distinguished Service Crosses and three Congressional Medals of Honor.
The Iroquois Confederacy, having declared war on Germany in 1917, had never made peace and so automatically became party to World War II.
By the end of the war, 24,521 reservation Indians, exclusive of officers, and another 20,000 off-reservation Indians had served. The combined figure of 44,500 was more than ten percent of the Native American population during the war years. This represented one-third of all able-bodied Indian men from 18 to 50 years of age. In some tribes, the percentage of men in the military reached as high as 70 percent. Also several hundred Indian women served in the WACS, WAVES, and Army Nurse Corps.
I hope this can give you some of the info you were asking for. I'll see if I can find out some more.
Regards Mikael