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In all of the years we've been coming to Afghanistan's capital city of Kabul,

it's never been this dangerous.

So dangerous that American personnel rarely drive on the city streets.

You can hear how bad it's become in the Afghan president's voice.

Your soldiers and your policemen are dying in unprecedented numbers.

Indeed.

How long can that be sustained?

Until we secure Afghanistan.

How long is that?

As long as it takes generations if need be.

The US isn't going to be here for generations.

We will be here for generations.

We do not need others to fight our fights.

You might think it's impossible to know what's going on inside North Korea's nuclear program.

Here I am.

But this American scientist was given a red carpet tour.

We got up to the second floor, looked down at a hole.

And you saw?

I was just flabbergasted.

I could not believe what I was seeing.

...