From the Summary: "This report provides a summary estimate of military forces that have reportedly been deployed to and subsequently withdrawn from the U.S. Central Command (USCENTCOM) Area of Responsibility (AOR), popularly called the Persian Gulf region, to support Operation Iraqi Freedom. For background information on the AOR, see [http://www.centcom.mil/aboutus/aor.htm]. Geographically, the USCENTCOM AOR stretches from the Horn of Africa to Central Asia. The information about military units that have been deployed and withdrawn is based on both official government public statements and estimates identified in selected news accounts."
CRS Report for Congress, RL31763