Few things are more damaging to our democracy than a military officer who doesn't have the moral courage to stand up for what's right or the moral fiber to step aside when circumstances dictate.

We're at a real time of transition here in terms of future aviation. What's going to be manned? What's going to be unmanned? There are those who see [the JSF] as the last manned fighter/bomber. And I'm one that's inclined to believe it-whether it's right or not.

We have to stop the killing. We need to let the refugees - we need to let Syrian citizens go home.

In every war at some point in time, you do sit down and negotiate.

The mission - the overall mission is to dismantle and defeat and disrupt al-Qaeda. But we have to make sure there's not a safe haven that returns in Afghanistan.

We can't kill our way to victory, and no armed force anywhere - no matter how good - can deliver these keys alone. It requires teamwork and cooperation.

The single biggest existential threat that's out there, I think, is cyber.