"Varying media estimates of military forces in Iraq have raised concerns about the actual number of troops deployed in Operation Iraqi Freedom (OIF). This report provides solely Department of Defense (DOD) statistical information on U.S. forces serving in Iraq. As of June 1, 2006, according to DOD, the United States had 128,789 troops stationed in Iraq -- 102,709 active component and 26,080 National Guard or Reserves. For security reasons, DOD does not routinely report the composition, size, or specific destination of military forces deployed to the Persian Gulf. This report will be updated upon receipt of new DOD data. For additional information on U.S. forces, see CRS [Congressional Research Service] Report RL31701, 'Iraq: U.S. Military Operations', by Steve Bowman."
CRS Report for Congress, RS22449