There is documented things he was doing during the Vietnam War I believe, so yeah, he wasn't even a Vietnam War vet. Even if he was I don't really see Mister Rogers having the heart to kill hordes of VC with his bare hands. He would have probably been telling them about milk or something. >3
Wow this video went viral fast. When I first saw it it had around 7 thousand views, when I posted this thread it had around 800 thousand, and this morning it has 1.8 million. I mean it does make sense, it is Mister Rogers after all.