For what I understand narwan have found good info about this unit. Having the historical orbat is a good start point. Also how the unit is organized will help doing a lot of different engagements, so I think this is quite good!
Forgot to mention that a wait of 1 week will be better in my opinion so other good idea may be taken into consideration! maybe mixing units, something like one come in support of another.. and so on..
Oh well, Boonierat have found the complete history book of the 1st cav div in the vietnam war! We can simulate even when and where the commander of the unit went to the toilet! Mmmmhhh this will cause some problem in turns 2 and 3 of the first scenario cuz the headquarter unit is very busy to find a good place for... ehm you know