Below is an estimated list of the major units deployed within the Multi-National Force – Iraq and other United States military units that were operating in Iraq under the U.S. Central Command (USCENTCOM) in 2009, during the Iraq War.

In military science terminology, the description of the units involved in an operation is known as the order of battle (ORBAT). NATO and the U.S. Department of Defense define the order of battle as the identification, strength, command structure, and disposition of the personnel, units, and equipment of any military force.

From September 2008 to 31 December 2009, the overall military commander in Iraq was General Raymond T. Odierno, Commander, Multi-National Force - Iraq (MNF-I) who reported to United States Central Command. MNF-I replaced Combined Joint Task Force 7 in May 2004. MNF-I consisted of Multi-National Corps - Iraq, Multi-National Security Transition Command - Iraq (MNSTC-I), and the Joint Contracting Command, Iraq/Afghanistan (JCCIA).

On January 1, 2010, Multi-National Force Iraq became United States Forces - Iraq.

Special Operations Task Forces

There is a distinction in U.S. military terms between the troops of Multinational Force-Iraq and forces which fall directly under CENTCOM's control but are in Iraq also. There are two special operations task forces operating in Iraq, Task Force 77 and CJSOTF-AP. Though TF 77, a 'black' force, does not answer to MNF-Iraq, it is included here for the sake of completeness of the U.S. forces operating within Iraq. TF 77 was under the command of the Joint Special Operations Command and its principal mission was to hunt down the leaders of al-Qaeda in Iraq (AQI).Army Times, SF presence may grow in combat areas, February 2008

Task Force 77—LSA Anaconda, BaladSean Naylor, Closing in on Zarqawi, Army Times, May 8, 2006 TF North/unidentified battalion 75th Ranger Regiment—unknown location, northern Iraq TF West/unidentified element, DEVGRU—unknown location, western Iraq TF Center/unidentified squadron, 1st Special Forces Operational Detachment - Delta—LSA Anaconda TF Black/unidentified squadron, 22nd Special Air Service, Baghdad and Basra areaThomas Harding, SAS trooper shot dead in al-Qa'eda raid, The Telegraph, March 27, 2008

The second force, which appears to be separate from TF 77, is the Combined Joint Special Operations Task Force-Arabian Peninsula (CJSOTF-AP). CJSOTF-AP is a "white", or unclassified, special operations task force that as of 2008 was always organized around the headquarters of either 5th Special Forces Group or 10th Special Forces Group.SF presence may grow in combat areas, 2008 Combined Joint Special Operations Task Force-Arabian Peninsula (CJSOTF-AP), itself answers to Special Operations Command Central.

Order of battle as of 2009 Unless otherwise noted, all units were U.S. in origin. This order of battle extends to battalion level and lists maneuver units only; artillery, support, special operations, and advisory units are not listed. Many brigade combat teams (BCTs) lent battalions to other BCTs during the course of their deployments, giving them "operational control" of those units. In such cases, the battalion's name is followed by "OPCON." Many higher-echelon units have two or more designations, often the formal unit around which the formation is based and then the name of the provisional task force; in these cases, both names are included, separated by a slash. Units were stationed at a variety of bases, including Forward Operating Bases (FOB), Contingency Operating Bases (COB) and Joint Security Stations (JSS).

Multi-National Corps - Iraq (General Raymond Odierno)—Camp Victory, Baghdad

Multi-National Corps Iraq/I Corps (Lieutenant General Charles H. Jacoby Junior), Multi-National Corps – Iraq Public Affairs Office, April 4, 2009 Was based at Camp Victory (primary component of the Victory Base Complex), north of Baghdad International Airport, and directed the following division-sized formations: 32nd Infantry Brigade Combat Team (32nd IBCT), Wisconsin Army National Guard (Colonel Steven Bensend)Lt. Col. Tim Donovan, Halfway point in Iraq: Around the 32nd Brigade , 32nd Infantry Brigade Combat Team PAO, September 7, 2009 Headquarters and Headquarters Company (HHC), 32nd Infantry Brigade Combat Team (32nd IBCT)—International Zone, Joint Area Support Group–Central 2nd Battalion, 127th Infantry Regiment—rear area security, Camp Bucca, Iraq 1st Battalion, 128th Infantry Regiment, Camp Cropper, Iraq 1st Battalion, 120th Field Artillery Regiment (1-120th FAR), Camp Cropper, Iraq 1st Squadron, 105th Cavalry Regiment, Camp Bucca, Iraq 132nd Brigade Support Battalion (132nd BSB)—rear area security, Camp Bucca, Iraq Brigade Special Troops Battalion (BSTB) 155th Brigade Combat Team (155th ABCT) (Colonel William L. Glasgow)— conducted base defense, force protection, personal protection and convoy escort security missions throughout Iraq Headquarters, 155th ABCT 106th Brigade Support Battalion (106th BSB) 155th Brigade Special Troops Battalion (155th BSTB) 2nd Squadron, 107th Cavalry Regiment, Troops Bravo and Charlie (OHARNG) - Camp Taji 2nd Battalion, 114th Field Artillery Regiment (2-114th FAR) 1st Battalion, 155th Infantry Regiment (Joint Base Balad) 1st Battalion, 98th Cavalry Regiment 2nd Battalion, 198th Combined Arms Battalion (2-198th CAB) 29th Brigade Combat Team (29th BCT), Hawaii Army National Guard (Colonel Bruce E. Oliveira) Headquarters and Headquarters Company (HHC), 29th Brigade Combat Team (29th BCT)—Camp Arifjan, Kuwait 29th Brigade Special Troops Battalion (29th BSTB) 29th Brigade Support Battalion (29th BSB) 1st Squadron, 299th Cavalry Regiment—Camp Virginia, KuwaitGregg K. Kakesako, High-tech training benefits isle Guard , Honolulu Star-Bulletin, October 21, 2008 1st Battalion, 487th Field Artillery Regiment (1-487th FAR) 1st Battalion, 184th Infantry Regiment (Air Assault) Al Saqr-Camp Falcon, Baghdad. Patrolled the most dangerous part of Downtown Baghdad Al Dora, Karada Street, Horajab, Al Sadr City. 100th Battalion, 442nd Infantry Regiment (Army Reserve)—Camp Arifjan, Kuwait 41st Infantry Brigade Combat Team (41st IBCT), Oregon Army National Guard (Colonel Daniel R. Hokanson)—Camp Victory, Baghdad 2nd Battalion, 162nd Infantry Regiment 1st Battalion, 186th Infantry Regiment 2nd Battalion, 218th Field Artillery Regiment (2-218th FAR) 41st Special Troops Battalion 141st Support Battalion 1st Squadron, 82nd Cavalry Regiment

Multi-National Division Baghdad

1st Cavalry Division (Major General Daniel P. Bolger)—Camp Victory, Baghdad Also known as Task Force Baghdad, this division headquarters was provided by the 1st Cavalry Division. The division's area of responsibility (AOR) was the city of Baghdad. MND-B headquarters was previously provided by Headquarters 1st Armored Division (2003–2004), Headquarters 1st Cavalry Division (2004), Headquarters 3rd Infantry Division (2004–2005), Headquarters 4th Infantry Division (2005–2006) and Headquarters 1st Cavalry Division (2006–2007), Headquarters 4th Infantry Division (2007–2009), Headquarters 1st Cavalry Division (2009–2010).

1st BCT, 1st Cavalry Division (Colonel Tobin Green) 2nd Battalion, 5th Cavalry Regiment 1st Squadron, 7th Cavalry Regiment 2nd Battalion, 8th Cavalry Regiment 1st Battalion, 82nd Field Artillery Regiment (1-82nd FAR) 115th Brigade Support Battalion (115th BSB) 1st Brigade Special Troops Battalion (1st BSTB)—Joint Security Station War Eagle 56th Stryker Brigade Combat Team (56th SBCT), 28th Infantry Division, Pennsylvania Army National Guard (Colonel Marc Ferraro)—Camp Taji, Taji 1st Battalion, 111th Infantry Regiment, [Tarmiyah, Iraq] 1st Battalion, 112th Infantry Regiment 2nd Squadron 104th Cavalry Regiment 328th Brigade Support Battalion (328th BSB) 856th Engineer Company 1st Battalion, 108th Field Artillery Regiment (1-108th FAR) D Company (Anti-Tank), 112th Infantry Regiment 656th Signal Company 556th Military Intelligence Company (556th MIC)

2nd BCT, 1st Infantry Division (Colonel Joseph M. Martin)—Camp Liberty, Baghdad 1st Battalion, 18th Infantry Regiment 1st Battalion, 63rd Armor Regiment 5th Squadron, 4th Cavalry Regiment 1st Battalion, 7th Field Artillery Regiment (1-7th FAR) Brigade Special Troops Battalion (BSTB) 299th Brigade Support Battalion (299th BSB) 70th Engineer Battalion 2nd Battalion, 112th Infantry Regiment (OPCON from 56th Stryker Brigade Combat Team, Pennsylvania Army National Guard) 30th Heavy Brigade Combat Team (30th HBCT) (Colonel Gregory A. Lusk)—FOB Falcon, Rashid district, Baghdad Sgt. Daniel Nichols, Relief in Place Begins Between Iron Brigade and Old Hickory, 2nd BCT, 1AD PAO, May 9, 2009 1st Battalion, 120th Infantry Regiment 1st Battalion, 252nd Armor Regiment 1st Squadron, 150th Cavalry Regiment 1st Battalion, 113th Field Artillery Regiment (1-113th FAR) 230th Brigade Support Battalion (230th BSB) 30th Brigade Special Troops Battalion (30th BSTB)

3rd BCT, 82nd Airborne Division (Colonel Timothy McGuire)—FOB Loyalty, Baghdad 1st Battalion, 505th Parachute Infantry Regiment (1-505th PIR) 2nd Battalion, 505th Parachute Infantry Regiment (2-505th PIR) 5th Squadron, 73rd Cavalry Regiment 1st Battalion, 319th Field Artillery Regiment (1-319th FAR) 3rd Brigade Special Troops Battalion (3rd BSTB) 82nd Brigade Support Battalion (82nd BSB) 1st Battalion, 5th Cavalry Regiment (OPCON from 2nd BCT, 1st Cavalry Division)—FOB War Eagle 2nd Lt. Scott Lewis, Black Knights Assume Mission in Adhamiyah, Multi-National Division - Baghdad Public Affairs Office, February 13, 2009 1st Air Cavalry Brigade, 1st Cavalry Division (Colonel Douglas Gabram)—Camp Taji, Iraq Sgt. Alun Thomas, 1st Air Cavalry Brigade Takes to the Skies Over Baghdad, 1st Air Cavalry Brigade, 1st Cavalry Division Public Affairs, June 3, 2009 Headquarters and Headquarters Company (HHC) 1st Battalion, 227th Aviation Regiment 2nd Battalion, 227th Aviation Regiment 3rd Battalion, 227th Aviation Regiment 4th Battalion, 227th Aviation Regiment 615th Aviation Support Battalion (615th ASB) 1-64th Armor Battalion, 2nd Brigade, 3rd Infantry Division

Multi-National Division South 34th Infantry Division - (Major General Rick C. Nash)—Contingency Operating Base Basra By Teri Weaver, 34th ID takes over civil mission in Basra, Stars and Stripes, May 22, 2009 Multi-National Division South, also known as Task Force Mountain, assisted the Iraqi Armed Forces with security in the area south of Baghdad ranging from Najaf to Wasit provinces extending to Basra. MND-South headquarters was provided by the 10th Mountain Division (Light) from Fort Drum, New York. The areas south of Baghdad were previously organized into Multi-National Division-Center, under U.S. leadership, and Multi-National Division (South East), which was provided by the British Army. The areas were merged into MND-South on March 31, 2009, to reflect the departure of the UK from Iraq.British withdrawal from Basra begins , United Kingdom Ministry of Defense, April 1, 2009 MND-Center took in portions of the area previously controlled by the long-disbanded Polish-led Multi-National Division Central-South.

The 34th Division transferred control of MND/USD-South to the 1st Infantry Division on February 2, 2010.

34th Infantry Division Headquarters 34th Infantry Division Special Troops Battalion 34th Military Police Company (34th MPC) 34th Infantry Division Band 4th BCT, 1st Armored Division (Colonel Peter Newell) 4th Battalion, 6th Infantry Regiment 2nd Squadron, 13th Cavalry Regiment 1st Battalion, 77th Armor Regiment—COB Adder, Iraq 2nd Battalion, 29th Field Artillery Regiment (2-29th FAR)—COB Adder, Iraq 121st Brigade Support Battalion (121st BSB) 4th Brigade Special Troops Battalion (4th BSTB) 172nd Infantry Brigade, Forward Operating Base Kalsu 1st Battalion, 2nd Infantry Regiment 2nd Battalion, 28th Infantry Regiment 3rd Battalion, 66th Armor Regiment 1st Battalion, 77th Field Artillery Regiment (1-77th FAR) 9th Engineer Battalion