Towards the end of the opening cast credits there states: And The three living survivors of the historic flag raising on Mount Suribachi Rene A. Gagnon (as Pfc Rene A. Gagnon), Ira H. Hayes (as Pfc Ira H. Hayes) and John H. Bradley (as PM3/c John H. Bradley).
Opening credits Historical note- The first American flag was raised on Mount Suribachi by the late Sgt. 'Ernest I. Thomas, Jr.', U.S.M.C. on the morning of February 23,1945.
Opening credits prologue:To the United States Marine Corps whose exploits and valor have left a lasting impression on the world and in the hearts of their countrymen. Appreciation is gratefully acknowledged for their assistance and participation which made this picture possible.
Opening credits: While this photoplay is based on the Battle for Iwo Jima, most of the incidents and, except where true names are knowingly used, all of the characters are fictitious. Any resemblance between any such events or characters and actual events or persons is coincidental.