Pretty simple.
Millions of Iraqi men women children, and American troops died because Bush Cheney Netanyahu wanted regime change, oil, mic interests, contracts with Haliburton, etc.
America invaded Afghanistan because the CIA and big pharma wanted their opium, poppy fields were booming coincidentally with their arrival and plummeted after their departure. Not related at all.
At the end of the day, most if not all wars are about oil, power and control, and drugs.
I'm sorry you're fighting for a patriotic reason that is meaningless to those in power. You're just a pawn and a chess piece they move around.
But if you went into Iraq and killed someone, that blood is on your hands and God will judge you appropriately. You did nothing to protect your country.