kellys heroes

Is the movie Kellys Heroes with Clint Eastwood based on a true story? I have a relative that comes up with winners like this one.:confused:

This “winner” is a loser. It was written as a comedy for a reason.

It’s also thinly veiled movie against the war in Vietnam. Telly Savalas is trying to convince the German SS guy in the tank, to join them and steal the money. He says something like:
“Why do we bother? You and me… We’re just ordinary guys. We don’t know what this war’s about or why we’re fighting. We might as well… blah blah blah”