I leave the country for a week, and stuff goes all wonky. Abizaid quit? Casey quit? Wow.
Some of the implications of this development are clear, I think. These two men, who had for so long advocated the President's Stay the Course strategy wherein more troops are a hindrance, needed to be disposed of before a troop surge could be implemented. The question is whether they resigned over the conflict, meaning they legitimately believed the current levels are correct, or whether they were retired in order for Gates to bring in his own team - people without the baggage of years of support for the current levels.
In other words, it looks more and more certain that Bush really will increase the troop strength. McCain can't be happy about that.