They really need to give their brigade organization a do-over!
The only reason I can come up with for these seven discrepancies [out of 57 Bdes], all located in the same area, is they are forming new divisions. Otherwise they should have redesignated over two years ago. Instead they have redesignated the Baghdad Bde as the 56th.
They are slowly standardizing to three line bns per brigade. It varies from 3 to 6 with the largest being in this article’s AOR. There are 21 more bns than the standard TO/E for the 14 existing divisions. Enough to organize 1.75 divisions with the current excess.