Chuck Hagel: “Are we going to continue to invest American blood and treasure at the same rate we are doing now, for what?”

It is the biggest responsibility any leader has, to leave the place better than they found it, and I do not think we are doing it right now.

There's a perception that it is the military's responsibility to fix the problem. Problems are not fixed by militaries.

When you have a national leader, our national world leader, who has left dignity behind, decency behind, honesty, integrity behind them, that's where you start.

Climate change is a national security threat.