- Much of the film was shot in 1967 at Ft. Benning, Georgia, hence the large pine forests in the background rather than tropical jungle trees.
- Some of the "Vietnamese village" sets were so realistic they were left intact, and were later used by the Army for training troops destined for Vietnam.
- The colonel who ran the jump school (and who was seen shooting trap with 'Wayne, John' ) was the real jump school commandant and a legendary commander of U.S. paratroopers.
- Late in the movie 'Wayne, John' can be seen to wrap his rappelling rope through a carabineer the wrong way. Called a "fatal hookup" in the Army, this would result in an immediate fall once weight was applied.
- Co-director Ray Kellogg was originally hired as the second-unit director to stage the various battle and action scenes. During filming, however, 'John Wayne' was so impressed with Kellogg's work that he elevated him to co-director status.
- David Janssen was working on this film when the final episode of his series _The Fugitive (1963)_ aired.
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