From Mosul
The latest word is that the attack was from a 122mm rocket. In some ways, this is good news. Rocket and mortar attacks are common, and most of them miss. Some don't. On the other hand, if it had been a bomb placed in the tent, or a suicide bomber actually among the troops, this would have indicated a much more serious security problem.
Apparently a concrete mess hall is under construction, and was scheduled to be completed by Christmas.
A chaplain milblogger was in the thick of it.
Belmont Club comments on this incident, and the media coverage, here.