What are some good movies about the military?

Some good movies where it is about the military.

Right now I am watching "The Guardian" With the United States Coast
Guard
I also saw this other movie where it was with the navy, and the first
African American joined. And he took a lot of crap from people.
I also saw "Saveing PVT Ryan"

That is all the ones I know of. Is there any others out there that are
good?

If there are, let me know which branch t is about, and a little about
the movie.