Good story, but actors too old to be infantrymen...
I've seen Pork Chop Hill many times and I have read the S.L.A. Marshall book that the movie is based on. The is a great story and a fine treatment of the battle by the movie.
But if you look at the faces and the bios of the actors, they are far too old to have been infantrymen in Korea. I give Gregory Peck some slack as he was fine, as always, in his role. But at age 43 in 1959 when the film was released, he would be too old to be 1st lieutenant. (Was his character Joe Clemons serving as "acting company commander" in the story? Even so, an infantry company commander, a captain, would not likely be over age 30 unless he was a so-called "mustang officer."
Most of the junior enlisted men were also too old in the movie face and bio wise. I base this take from having been a Marine infantryman in Vietnam in 1968, and also from extensive reading on WWII, Korea, Vietnam, and other wars.
I am not one to let a few details or errors ruin a good story, be it in print or on film. I give Pork Chop Hill a B minus, which is a good movie grade on my scorecard.
Compare the faces and bios of the actors in Oliver Stone's "Platoon" and how much more realistic they appear age wise as compared to Pork Chop Hill. I suspect that the producers in 1959 did not want to go with a cast of largely unknown actors as "Platoon" did.