If you want a really subtle anti-war film about a fictional conflict, check out the original Red Dawn (1984).

WTF am I saying?

Watch the entire film. The "Wolverines" suffer 80% casualties and the only two survivors do so by running away. The "bad guys" aren't one dimensional, with the singular exception of zampolit General Bratchenko.

The one character who undergoes the most personal growth in the entire film is bad guy Colonel Ernesto Bella. He goes from being proud, to being disgusted with what he's become, and finally resolves to resign and return to his wife in Cuba. In the end, he lets Matt and Jed Eckert go, saying "Vaya con Dios" ("Go with God"), a strange thing indeed for a committed Communist to say.

Plus, don't even know if the US won the war at the end. The ending narration is ambiguous about the matter:

Erica: [closing narration] I never saw the Eckert Brothers again. In time, this war - like every other war - ended. But I never forgot. And I come to this place often, when no one else does. "... In the early days of World War 3, guerillas - mostly children - placed the names of their lost upon this rock. They fought here alone and gave up their lives, so that this nation should not perish from the earth."

The USA still survives, and the area around Calumet is apparently back in US hands, but that doesn't necessarily mean the USSR and its allies were completely thrown out of US territory, the only real way you can define a "win" when you've been invaded. Calumet was only about 40 miles behind enemy lines. USSR could still occupy much of the plain states and that ending narration would still be true.

Also, that particular ending was tacked on at the insistence of the studio, who wanted a "happy ending" unlike the ambiguous one John Milius wanted. He still managed to make it ambiguous.