There is nothing I can do to undo what I did. I can only say again how sorry I am to those I let down and then strive to go forward with a greater sense of humility and purpose, and with gratitude to those who stood with me during a very difficult chapter in my life.

I considered our British comrades to rank with the finest men and women of any armed service in the world. And I know that my fellow American soldiers - and those of the other coalition countries under my command - valued very highly the professional expertise, capability, courage, and determination of our British partners on the battlefield.

In the 101st Airborne Division headquarters in Mosul, we had a sign on the wall. It was a question that we would ask ourselves before every new operation or policy initiative. It asked: Will this policy or operation take more bad guys off the streets than it creates by its conduct?

The idea is to go to bed every night with fewer enemies than you had in the morning.

We periodically note that there are no silver bullets, there are no magic formulas, there's no single action or component of the overall... comprehensive civil-military approach.

At least from a national security standpoint, none of the problems the U.S. and U.K. face will become easier to solve if the U.K. is out of the E.U.; on the contrary, I fear that a 'Brexit' would only make our world even more dangerous and difficult to manage.