Hanley was kept at the same detention camp alongside Zamperini and Graves is one of the people, who survived the Battle of Iwo Jima and witnessed the raising of the flag, reported Ace Showbiz.
Hanley served as a pilot of a Boeing B-29 plane which was shot down in the pacific in early 1945. He also served as a resource for the movie's producers.
'Unbroken', which stars Jack O'Connell as Zamperini and Miyavi as a brutal guard called 'The Bird', opened in theaters this week.
'Unbroken' is a drama film directed by Angelina Jolie. It is a biopic of World War II survivor and Olympic athelete Louis Zamperini and is based on the 2010 non-fiction book by Laura Hillenbrand 'Unbroken: A World War II Story of Survival, Resilience, and Redemption'.