In the police force, two, three, five traitors are detected who are really working for someone else. When we cleanse the police of them, the problem will be simplified a lot. Terrorists will have no one to contact - they will be left without informers.
“After the loss of Columbia a couple of years ago, I think we were reminded of the risk. All of us, though, have always known that the Space Shuttle is a very risky vehicle, much more risky than even flying airplanes in combat.”