My favourite war movie would be Full Metal Jacket and if you mean World War II, then I recommend watching Band Of Brothers. It's my the same people that made Saving Private Ryan and just as good if not better. Oh and it's ten episodes of one hour. So you do the math.
For a thriller I would recommend The Gift by Sam Raimi. It's a real cool movie about a backwater town where a girl is murdered and a psychic is asked for help though she is mocked by many of the townsfolk. A truly great piece by the director of both the Evil Dead series and the Spiderman trilogy. Oh, and it has an awesome cast: Keanu Reeves, Kate Blanchett, Katie Holmes, Giovanni Ribisi, Hillary Swank and the guy that plays Jonah Jameson in Spiderman.