PROOF OF LOYALTY tells the story of a Japanese American who played a crucial strategic role in World War II. Kazuo Yamane and his fellow Nisei from Hawaii combatted prejudice and discrimination to loyally serve their country. Their extraordinary service, mostly untold, ultimately changed the course of U.S. history.

Kazuo Yamane, first educated in the discriminatory Hawaiian school system, and eventually graduating from Waseda University, the Harvard of Japan, was drafted into the US Army just before the attack on Pearl Harbor. Plucked from the infantry ranks for his exceptional knowledge of Japanese, he would serve at the Pentagon, then a secret facility in northern Maryland, and finally under Eisenhower in Europe. Most importantly, he would identify a secret document that would significantly help America’s war in the Pacific.

The absolute loyalty of the Nisei soldiers in World War II, despite discrimination and incarceration provides an insight for us today. These American citizens protected their beloved country, even while many Americans suspected them of being the enemy. Diversity powers America, but also keeps us safe—one only has to look at these Nisei, like Kazuo Yamane, for ample proof.

Proof of Loyalty Preview Clip




“The documentary contains a great lesson to these difficult times, when bigotry and bias are on the rise: diversity is what has made America great.”

“In this time, especially, with many immigrants having their military service questioned and even ended, Proof of Loyalty is a powerful reminder that America operates best, even during times of war, when it embraces its diversity.”

“Proof of Loyalty is a timely film that explores the power of diversity in a time of war.”

Information & Outreach

For more information about the film and upcoming screenings visit

A “public performance” is any performance of a videocassette, DVD, videodisc or film which occurs outside of the home, or at any place where people are gathered who are not family members, such as in a school or library. In most cases titles sold are restricted to home use only and do not include public performance rights. 

2022 All Rights Reserved