Yes, but everyday heroes like social workers aren't ordered to kill people. You can't have a sudden attack of morals in the middle of a firefight.
You give up on politics and do what you're told, and national interests rarely ever fuse with morals. If you believe your country's military to be some kind of generally benevolent organization for the suppression of evil and the upholding of good, you are surely deluding yourself, no matter where you are from.