If there is such a thing as an anti-war movie, Letters from Iwo Jima is it.
I have never seen a film in my life that so consistently managed to not make war seem awesome. Platoon was supposedly an anti-war movie, but it was also really cool. Deer Hunter was supposedly an anti-war movie, but it made the Vietnamese out to be sadistic psychopaths. Even Apocalypse Now, one of my favourite (anti-)war movies, had a few (satiric!) sequences that were just really awesome with explosions and helicopters and Ride of the Valkyries and everything.
Iwo Jima shows that both sides have good guys and both sides have bad guys and killing each other systematically is just so goddamn futile. I really don’t know how Clint Eastwood turned out to be such a fantastic director, but I hope he keeps them coming.