Korean language war movie


I'm looking for a movie for someone else. His grandfather was in a Korean language movie, and he believes the movie was filmed in the 1950's. His grandfather's name was Jack H. Taylor - Jack is commonly given to someone with the first name of John, so his name might be John H. Taylor in the movie. Jack Taylor is a common name, and I found others with that name. He served in the Army from 1945 to 1965 and was a Supply Seargent in Korea.

He played a 4 star general in the movie. It was fully or partially Korean language movie, so he didn't have a big part, and a lot of Korean movie listings don't list non-Korean actors.