Last December, when the National Intelligence Estimate downgraded the immediate nuclear threat from Iran, it seemed as if Fallon's caution was justified. But still, well-placed observers now say that it will come as no surprise if Fallon is relieved of his command before his time is up next spring, maybe as early as this summer, in favor of a commander the White House considers to be more pliable. If that were to happen, it may well mean that the president and vice-president intend to take military action against Iran before the end of this year and don't want a commander standing in their way.

Admiral Fallon resigned this morning. Is the balloon going up?