The Young Lions
Ben Hur - Charlton Heston
Full Metal Jacket - best depiction of basic training, if you ignore the performance by Vincent D'Onofrio, which is totally cringe.
Silent Running
Black Hawk Down
Star Wars - if you saw it when it first came out.
Shane
Sin City
Mash
West Side Story
Could make many "Best Ten" movie lists. First real movie I saw was Moby -blam!- in 1956 so I've seen a ton of movies.
It's just over the top and takes away from what basic was like. I did basic at Ft. Ord in 1971 during Vietnam. Except for the choking part and that bad performance it was spot on. Glad you enjoyed his performance. I didn't mind him too much as Wilson Fisk in Dare Devil.