Civil Affairs, Psyops, Aviation, SF, Ranger, Delta, etc. are all units under the Special Operations command. Go to the following or other USASOC links:
http://www.globalsecurity.org/military/agency/army/ca-psyop.htm
A Civil Affairs unit would have been working directly with the Iraqis working on assistance to the population and on intel. The Units of the Civil Affairs & PsyOps Command are:
Units
4th PSYOP GP (AR)
96th Civil Affairs Battalion (Airborne)
Reserve Units
2nd PSYOP GP (AR)
7th PSYOP GP (AR)
350th CA Command
351st CA Command
352nd CA Command
353rd CA Command
361st CA Brigade
412th CA Battalion
451st CA Battalion
Facilities
Fort Bragg, NC