Brigade combat teams:
30th Heavy Brigade Combat Team, NC National Guard
56th Stryker Brigade Combat Team, 28th Infantry Division, PA National Guard
Security force brigades:
56th Brigade Combat Team, 36th Infantry Division, TX National Guard
29th Brigade Combat Team, HA National Guard
81st Brigade Combat Team, WA National Guard
45th Fires Brigade, OK National Guard
Detention Operations:
50th Brigade Combat Team, NJ National Guard
Clearly, not all of the units are being sent at full strength. The first two units at full strength would have 3,500 and 4,500 troops, respectively. Since they will replace regular forces, I assume they are full strength.
The other four brigade combat teams and the smaller artillery (Fires) brigade total 10,000, so can't be full strength. Perhaps logistical and other support elements aren't being sent to focus just on the headquarters units and combat units organized as infantry units to provide base and convoy security. I'd guess that the units will command other units in addition to their own once they arrive in Iraq and Kuwait.
They will serve 9 months on the ground there.
In going from 20 brigades (including 18 Army brigades) to 15 (13 Army brigades), 2 of the Army brigades in Iraq will be National Guard. This will be welcome relief for the active Army.