It’s an unmitigated disaster for Brian Williams and NBC News.

The revelation that the NBC anchor had lied on air about being in a helicopter that was forced down after it was hit by enemy fire during the Iraq War is devastating.

It’s hard to see how Williams gets past this, and how he survives as the face of NBC News.

An anchor’s No. 1 requirement is that he or she has credibility. If we don’t believe what an anchor tells us, what’s the point?

It’s disturbing that Williams has told many different versions of this story over the years. In some he was in a helicopter that was hit by enemy fire. In some he was in one near the chopper that was hit.

This from a man whose word should be gospel to us?