There have been a ton of Korean War movies:
The Bridges at Toko-Ri
Pork Chop Hill
The Steel Helmet (a particularly excellent movie, by the way)
even
Mad Men has roots in the Korean War
There’s lots of others
I will check out The Steel Helmet. It’s a stretch to call it a ton. It’s received nothing like the coverage of Vietnam. I had forgotten about the origins of Don Draper on Mad Men.
I just watched Pork Chop Hill again a few months ago, and was struck by how well it depicted small unit tactics.
I like “Korean Patrol” (1951), one of the first movies about the war. Another that I like is “The Hunters” (1958), which focuses on air combat. The “Soviet MiG-15’s” in the film are actually American F-84 Thunderstreaks.