Who is Pete Zamperini from Unbroken: A World War II Story of Survival, Resilience, and Redemption and what is their importance?

Pete Zamperini was the older brother of Louis. Pete was a popular young man, successful at school and in sports. When he saw his younger brother endangering his future by getting into trouble, he steered him into competing in track where Louis succeeded. Pete was a faithful supporter of his brother, never giving up hope that he was alive during the years that he was missing.