1. The movie's a political satire, it isn't meant to be taken seriously. For whatever reason, the right doesn't usually "get" irony or satire, so I'm not surprised at their reaction.
2. The right has absolutely no claim on the military, despite suckering most of them into voting for them. They send them into unnecessary conflicts, killing or at least maiming them for life (physically and/or mentally), then cut their benefits when they get home. But then, if the right actually voted for their own self-interest instead of what their corporate leaders tell them is "good for the country", they wouldn't be Republicans.