Demonstrate to the world there is "No Better Friend, No Worse Enemy" than a U.S. Marine.

Our world is becoming darker. The dangers are increasing from North Korea, whose recent provocation underscored the need to impose a higher price on this rogue regime, a problem that is not just the United States alone, but a problem for us all.

What would you do differently as defense secretary to compensate for this record in which the greatest military in the world, as we are constantly told, doesn't get the job done?

Nothing keeps me awake at night. I keep other people awake at night.

There is nothing better than getting shot at and missed. It's really great.

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

Since 9/11 we've been engaged in wars around the world, and General [James] Mattis has been a leading battlefield commander in many of those theaters, including in the April 2004 siege of Fallujah, where the US Marines killed so many people that the municipal soccer stadium in the city had to be turned into a graveyard for the dead.