Via Instapundit, who got an email from Michael Yon - comments that pretty much reflect what I wrote earlier today:

The United States has again called upon General David Petraeus during crisis. There have been other times, the most remarkable being in January 2007 when we were on the cusp of losing the war in Iraq. The chances against success were increasingly remote. I was there through the entire surge, and more, and saw the remarkable transformation under command of General Petraeus and due to the incredible efforts of our armed forces and civilian counterparts. No book that I have read, including the one that I wrote, has fully conveyed the magnitude of those days. You simply had to be there.

Here we are again. This time on the cusp of losing the war in Afghanistan. The situation is worse than ever before. Again, the United States has asked General David Petraeus to step into a situation that seems hopeless to many people. It is not hopeless, just extremely bad. All is not lost, just nearly lost. Our people can turn this war around.