Don't be afraid to challenge the pros, even in their own backyard. Learn from the pros, observe them, seek them out as mentors and partners. But remember that even the pros may have leveled out in terms of their learning and skills. Sometimes even the pros can become complacent and lazy.

In the military we also learn principles of war which also work in a corporate setting: How do you concentrate as much of your force as possible on a critical point and take a risk elsewhere? In business that translates into focusing your investment on marketing, sales, or R&D, whichever will give you the greatest return.

Terrorism really flourishes in areas of poverty, despair and hopelessness, where people see no future

Our strategy in going after this army is very simple. First we are going to cut it off, and then we are going to kill it.

When you decide to get involved in a military operation in a place like Syria, you've got to be prepared, as we learned from Iraq and Afghanistan, to become the government, and I'm not sure any country, either the United States or I don't hear of anyone else, who's willing to take on that responsibility.

There is a war on terror that must be fought. Nobody's immune... And so rather than finding fault with what Spain has done by being aggressive in the war on terror, this should redouble everyone's efforts to go after terrorist organizations of any kind... Terror has to be brought to an end.

I don't know that there is much the United States can do except work with the international community.