- The real Ernie Pyle was killed by Japanese gunfire while this film was in production.
- The extras in the film were real American G.I.s, in the process of being transferred from the war in Europe to the Pacific. Many of them were killed in the fighting on Okinawa, the same battle in which Ernie Pyle was killed, never having seen the movie they appeared in.
- "Wild Bill" Wellman, the film's director, was a fighter pilot in World War I, and hated the infantry, and he therefore had no interest in making a film about them. Lester Cowan, the producer, tried several times to convince Wellman to direct the film, including showing up uninvited at Christmas with gifts for Wellman's children. Wellman finally agreed to take the job only after meeting and spending several days with Ernie Pyle at Pyle's home in New Mexico, where he saw how much former infantrymen revered him.
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