100 Oklahoma Goldback | Aurum Gold Foil Note (24k)The Oklahoma 100 Goldback stands as a tribute to one of the most storied military units in U. S. history: the 45th Infantry Division, known proudly as the Thunderbird Division. In 1923, the 45th was forged from the Oklahoma National Guard, including an extraordinary number of Native American service members from the Five Civilized Tribes. Their most defining mission came on April 29, 1945, when they helped liberate Dachau Concentration Camp,