There is no reason to think that any American who has fought in any war has done anything at all to defend the freedom of any American citizen.
This is very obviously true. Indeed, even the claim that WWII vets have done anything suchlike would have to be heavily qualified; I suppose a case could be made for the Revolutionaries, though it's complicated. A much clearer argument holds for the Union in the Civil War, but that gets canceled out by the fact that the Confederacy was fighting to protect slavery, an institution that has by definition nothing to so with "freedom."
But saying things that are true bothers garbage patriots, like, say, David French.