This is a very well made war movie, though I've got to admit that this is a genre that usually doesn't do that much for me. What sets this movie apart is its strong desire for realism--instead of a Hollywood version of war, this WAS war as it really appeared. Fanatics who love realism will really be pleased about this. Plus, it focuses on the Korean War, a period in our history that is generally ignored in movies.
Gregory Peck does a fine job in the lead, though I thought he looked a little old to be such a fine career soldier and only a lieutenant. At his age, he could have easily been playing colonels or even a general.
The supporting cast are a lot of then unknowns who later went on to more visible careers. Watch the movie and see all the familiar faces.
About the only negative of this movie is its pace. It involves one engagement and seems a bit "claustrophobic" or static at times, as you have trench after trench and explosion after explosion. Still, it's pretty good stuff.