Our challenge in this new century is a different one, ... It's really to defend our nation against the unknown, the uncertain and, what we have to understand, will be the unexpected. That may seem on the face of it an impossible task but it is not.
You cannot defend against terrorists by hunkering down, ... You simply must go after them. That is the only proper defense is an offense.
It's impossible ... to defend in every location against every conceivable kind of attack at every time of the day or night,
The challenges of the new century aren't nearly as predictable as they were during the Cold War, ... Our challenge is to defend cities and infrastructure from new forms of attacks.