Well, does anyone else feel like the phrase is being overused?
It's supposed to be a blessing that supports faith and freedom, but it's been used so often in war movies sarcastically by people who try to justify their crimes by saying it, that it gets like saying "we can't be wrong; God is on our side".
In fallout 2 the self-titled President of USA, controlling not much more than a super-fortified oil rig, in response to your question "President of America? WHAT America?" says:
"The United states of America. It still exists, you know. God bless America". That is so ironic that it's simply genius.
Just my thoughts, hehe.