I'm sure I'm preaching to the chior,
But check out Kubrick's
Paths of Glory with Kirk Douglas. (1957) He could have shot it in color, but the B&W gore is so much more effective. Heart wrenching trench war madness.
M*A*S*H was released in 1970, but has sixties written all over it. I remember how blown away I was when I 1st saw this one.
Donald Sutherland is one of my favs.
Johnny Got His Gun is the most frightening war movie I can remember. His Jesus, as an engineer of a train to glory, is unforgettable.
Peter O'Toole in 66's
Night of the Generals is an off-beat gem. Lawrence of Arabia is my favorite Lean movie though.
Richard Burton leads a ragged patrol against Rommel in 1953's
The Desert Rats . James Mason gives real humanity to his Desert Fox character.
1969's
Secret of Santa Vittoria isn't a war movie in the traditional sense either. Anthony Quinn leads his Italian village in an effort to hide their wine from the Germans. Worthy cause
The Ipcress File in 1965 is a clever, well made cold war spy flick. Michael Caine is killer as a secret agent who isn't a super hero, just a soldier without a uniform. Check it out.
The Sand Pebbles (1966), was a great book, and a epic movie. Steve McQueen leads an all star cast on a gunboat in China. Full of great scenes, never get off the boat.
(Whoops) Almost forgot my favorite wwii buff movie, 1964's
633 Squadron . Thrilling mossie action against a heavy water factory guarded like the deathstar!
Stay on target...