They're not risking their lives for your country, they're doing it so that american corporations can make more profit.
I highly recommend you read "war is a racket" written by General Smedley Butlers.
I also want to point out that I don't blame anyone who's working for the US military, unless they're like Dick Cheney or something, I understand that people need to make a living, and that a lot might even buy into the big ol' patriotic lie.