If you don't like slow build up movies I'd recommend you don't watch these.
Platoon. Directed and written by Oliver Stone an actual Vietnam vet. Based on several men he fought with from different platoons all rolled into one. Its an '80s war film so don't expect Saving Private Ryan effects.
Heat. Al pacino(cop) and Robert de niro(robber). De niro is a real pro who doesn't fuck around and al is a hardcore cop relentless and on the prowl.
1. Dawn of the Dead(original)group of runners take over a mall and make it their life in the zombie apocalypse. 2. Day of the dead. Government research in developing a zombie cure the survivors start to break down in the bunker and become their own enemies.(Classic zombie movies by what I believe as the father of zombie films).
These are not as much old as the above...
Team America. America fuck yeah!
Tusk. About a sensitive old man who shares his memoirs of his life and love for a walrus.
Tropic thunder - paradoy of dramatic films and lingo in Vietnam war films. Pokes fun at platoon. But hey its just a movie.