When I was a kid I was convinced that the Good Old USA (and John Wayne) WON the war. But, after becoming a bit of a history buff I came to realize that we were just a part of a "Team Effort".
Yes, we lost a huge number of men. God bless them all because they helped to SAVE the world. Of the major players involved we lost the least and gained the most. Before WWII we were of little consequence in the world. After WWII we were number one.
Take a look at how fast Russia was building tanks. Stalin would have killed millions of his soldiers to defeat the Germans without hesitation.
As for Vietnam.......remember Ike's farewell speech: Beware of the military industrial complex.
