145th Engineer Combat Bn

[CaptO]

That's one thing I never understood about the Army - its need to have such a complicated number system for units. I suppose it come from being so darn large, but compared to the Marines, it is hardly understandable. In the USMC (with the exception of the Air Wings) things are very logical:

Location MEF Division Regiments Tank Bn Arty Rgmt MEUs
California I 1st 1st, 5th, 7th 1st 11th 11th, 13th, 15th
Camp Lejeune II 2nd 2nd, 6th, 8th 2nd 10th 22nd, 24th, 26th
Okinawa III 3rd 3rd None 12th 31st

Now III MEF is kind of different from the other two because of the fact that we are over here in Japan and Hawaii and don't have as much space to spread out. The USMC does not have congressional authorization to be at 3 full MEF strength, in any case. But you can see the logic to everything. The Air Wing numbers are reversed from what the divisions are:

Cali 3rd Marine Air Wing (MAW)
Lejeune 2nd MAW
Oki 1st MAW (my current home)

And when the USMC expanded during WWII - we just added the 4th, 5th, and 6th Marine Divisions. See? Easy peasy.