The American people and the American military will never get used to civilian casualties. And we will - we will fight against that every way we can possibly bring our intelligence and our tactics to bear. We're not the perfect guys, but we are the good guys.

Right now, Russia's future should be wedded to Europe. Why they see NATO as a threat is beyond me. Clearly, NATO is not a threat.

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

There is no corporation in the world that would, in a competitive environment, try and concentrate all decisions at the corporate level.

General [James] Mattis's primary experience - indeed, his only experience - is as a member of the United States Marine Corps, where he served for 41 years. That's his experience.

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.

You cannot allow any of your people to avoid the brutal facts. If they start living in a dream world, it's going to be bad.