. . . the Ken Burns PBS documentary The War. If you do, you will be hard-pressed to disagree with Tom Brokaw that those Americans were indeed the Greatest Generation. I'm still catching up after DVRing the first three episodes but, if you want to start in tonight, they're showing D-Day. I'm sure they'll re-air it eventually, but it's absolutely riveting footage.
I can't imagine we could ever do that again.