Hold Back the Night Allan Dwan, 1956
A real military action during the last year of the Korean War is re-enacted on the spot with real soldiers.
Cease Fire (1953)
A real military action during the last year of the Korean War is re-enacted on the spot with real soldiers.
Cease Fire! is a 1953 war movie directed by Owen Crump. The film featured real ammunition and real soldiers that were filmed on location in Korea, and was the first 3D war movie filmed in an actual theatre of operations.
https://en.wikipedia.org/wiki/Cease_Fire_(1953_film)
https://www.imdb.com/title/tt0045616/