 This film contains the first known instance of "The Wilhelm Scream"  (a sound effect of a man screaming, since used in over 70 other  movies). During a scene in which the soldiers are wading through a  swamp in the everglades, one of them is bitten and dragged  underwater by an alligator. The scream for that character was  recorded later. Six short pained screams were recorded in a single  take, which was slated "man getting bit by an alligator, and he  screams." The fifth scream was used for the soldier 