World War II Navajo veterans and supporters march through the reservation/AP.

"The Warrior Tradition," a new film set to air on PBS, examines the complex history of Native Americans in the U.S. military since World War I and how their service transformed the lives for Native Americans from various tribes. Through interviews with veterans and using archival footage, the documentary probes the complicated relationship Native Americans had with military service and how they used it to press for civil rights.

The documentary exhibits the mixed feelings some Native Americans felt toward the U.S. military and how tribal members embraced those who served as "warriors."

At the onset of World War I, the first generation of Native Americans after the so-called Indian Wars began joining the U.S. Army even though they weren't considered citizens or allowed to vote. Returning veterans, and also those from World War II, earned accolades for their service. For example, Comanche and Navajo Code Talkers in World War II were credited with passing secrets amid hostile fighting.

The returning veterans began demanding the right to vote and fought against discrimination. For example, Miguel Trujillo Sr., a Marine sergeant in World War II and a member of Isleta Pueblo in New Mexico, returned and waged a legal battle to overturn that state's law that barred American Indians living on reservations from participating in elections.

Director Larry Hott said the veterans in the film believed military service was part of their family history and wasn't just about a way to escape poverty. It's part of a legacy that goes back generations, he said.

"Many have waited a long time to talk about this," Hott said. "One veteran told me he hadn't even told his wife about his experiences."

Retired Army Sgt. Maj. Lanny Asepermy, who is Comanche and Kiowa, said after the Comanches surrendered to the U.S. in 1875, the tribe's warrior tradition was hurt. Then some Comanche joined World War I.

"We became warriors again," Asepermy said. He grew up seeing photos of relatives in the military at his grandparents' home. "I've always wanted to be a soldier. I didn't want to be anything else."

He'd fight a year in Vietnam. Before he left, his grandmother prayed over him in the Kiowa language and placed medicine on him. "A couple of times in Vietnam, I could have gotten killed. Was it luck?" "I think it was because of the prayers my grandmother gave me,” said Asepermy.

The one-hour documentary co-produced by WNED-TV Buffalo Toronto and Florentine films/Hott Productions, Inc., is scheduled to air on most PBS stations on Monday.

Associated Press.