Canadian, I found a duplication...i think.
Amphibious Squadrons 8, 9 and 10 respectively have 1/9, 2/9, and 3/9 assigned to them. But 10th MEB under III MEF also has those three battalions assigned.
No big deal, on my copy of your OOBs Im just going to reactivate the 21st Marine Regiment and place it in 10th MEB.