John McCain being interviewed by Mother Jones magazine in the Nov/Dec 1998 issue (emphasis added) ...

MJ: You not only have had combat experience in Vietnam, but you were also a prisoner of war. When you look at terrorism right now, with people like Osama bin Laden, do you have any reservations about watching strikes like that?

John McCain: You could say, Look, is this guy, Laden, really the bad guy that's depicted? Most of us have never heard of him before. And where there is a parallel with Vietnam is: What's plan B? What do we do next? We sent our troops into Vietnam to protect the bases. Lyndon Johnson said, Only to protect the bases. Next thing you know.... Well, we've declared to the terrorists that we're going to strike them wherever they live. That's fine. But what's next? That's where there might be some comparison.

(ed.note: Special thanks to TPM Reader SM for the tip.)