The Second Brigade was redeployed to Fallujah, Iraq during the summer of 2003. The division returned to the United States in September 2003. Order of Battle during 2003 invasion: Beginning in 2004, the 3rd began re-organizing. The division shifted from three maneuver brigades to four "units of action", which are essentially smaller brigade formations, with one infantry, one armor, one cavalry, and one artillery battalion in each. The former Engineer Brigade became the 4th Brigade at Fort Stewart. Each of these units of action engaged in several mock battles at the National Training Center (NTC) and Joint Readiness Training Center (JRTC), and preparation for a second deployment to Iraq. In January 2005, the Third Infantry Division became the first Army division to serve a second tour in Iraq. The division headquarters took control of the Multi-National Division Baghdad, MND-B, headquartered at Camp Liberty and with responsibility for the greater Baghdad area. First and Third Brigades of the Third Infantry Division were placed under control of the 42nd Infantry Division, and later under the 101st Airborne Division, in MND-North. In preparation of this deployment a Fourth Brigade was organized and became the first cohesive brigade combat team sent into a combat zone by the US Army, cohesive in that it fulfilled the table of organization requirement of such a unit. The California Army National Guard's 1st Battalion 184th Infantry Regiment served as one of the brigade's two infantry battalions, as well as the detachment from the Hawaii Army National Guard's 29th Brigade Combat Team, the 2/299th Infantry, also the 48th Brigade Combat Team from the Georgia Army National Guard, 2/130 Infantry Battalion of the Illinois National Guard, and Charlie Company, 1st Battalion, 295th Infantry Battalion from the Puerto Rico Army National Guard served in this Operation.  2/69 Armor was assigned to Camp War Horse in Iraq. By Mid 2005 Primary elements of 2/69 Armor 3rd Brigade 3rd Infantry Division was re-deployed to Ramadi Iraq, replacing elements of the 2nd ID. They ran joint missions with 2nd Mar Div. and elements of the Pennsylvania National Guard and the 2/130th Infantry of the Illinois National Guard who was redeployed as to Al Taquattum as the infantry battalion. The division redeployed to Fort Stewart and Fort Benning in January 2006. On 17 November 2006, the Army announced that the Third Infantry Division is scheduled to return to Iraq in 2007 and thus become the first Army division to serve three tours in Iraq.