Among them:

In 1991 the secretary of defense, explaining the lack of wisdom of regime change, said: "Once you've got Baghdad, it's not clear what you do with it. It's not clear what kind of government you would put in place of the one that's currently there now. Is it going to be a Shia regime, a Sunni regime or a Kurdish regime? Or one that tilts toward the Baathists, or one that tilts toward the Islamic fundamentalists? How much credibility is that government going to have if it's set up by the United States military when it's there? How long does the United States military have to stay to protect the people that sign on for that government, and what happens to it once we leave?" Was Dick Cheney right?

In 2000, before becoming George W. Bush's national security adviser, you questioned the use of U.S. military forces in peacekeeping operations: "Carrying out civil administration and police functions is simply going to degrade the American capability to do the things America has to do. We don't need to have the 82nd Airborne escorting kids to kindergarten." Are current noncombat operations in Iraq degrading U.S. military capabilities?

Link.

I don't agree with all of Will's characterizations, but I'm glad to see at least someone is willing to ask the questions (though I wish some Senators would, as well, at the confirmation hearings).

By the way, this reminds me of this Seinfeld gem...

Kramer: You know, I'll tell you who's an attractive man: George Will.
Jerry: Really?
Kramer: Yeah. He has a clean look--scrubbed and shampooed.
Elaine: He's smart...
Kramer: No, no. I don't find him all that bright.