The United States has been essentially engaged in an ongoing war that most people date from 2001. That war has taken us to Afghanistan, to Iraq, in a lesser way to other countries - Libya, Somalia, Yemen.

2017 is going to be another tough year for the valiant Afghan Security Forces and the international troops who have stood and will continue to stand shoulder to shoulder with Afghanistan against terrorism.

There are some people who think you have to hate them in order to shoot them. I don't think you do. It's just business.

Find the enemy that wants to end this experiment (in American democracy) and kill every one of them until they're so sick of the killing that they leave us and our freedoms intact.

I don't see lethality as the problem. I mean, the lethality of US forces is quite remarkable.

Treachery has existed as long as there's been warfare, and there's always been a few people that you couldn't trust.

We can kill lots of people. We do kill lots of people. We can destroy virtually anything we choose to destroy.