official in the US government. US National Intelligence Director– John Negroponte resigned and became Deputy Secretary of State. Retired Admiral John M. McConnell took his place. White House Counsel– Harriet Miers stepped down. She was replaced by Fred Fielding. Units deployed The six US Army brigades committed to Iraq as part of the surge were 2nd Brigade, 82nd Airborne Division (Infantry): 3,447 troops. Deployed to Baghdad, January 2007 4th Brigade, 1st Infantry Division (Infantry): 3,447 troops. Deployed to Baghdad, February 2007 3rd Brigade, 3rd Infantry Division (Heavy): 3,784 troops. Deployed to southern Baghdad Belts, March 2007 4th Brigade, 2nd Infantry Division (Stryker): 3,921 troops. Deployed to Diyala Governorate, April 2007 2nd Brigade, 3rd Infantry Division (Heavy): 3,784 troops. Deployed to the southeast of Baghdad, May 2007 1st Brigade, 10th Mountain Division (Light), September 2007 Deployed to Kirkuk This brought the number of US brigades in Iraq from 15 to 20. Additionally, 4,000 Marines in Al Anbar had their 7-month tour extended. These included Marines from the 15th Marine Expeditionary Unit, 31st Marine Expeditionary Unit, the 2nd Battalion 4th Marines, the 1st Battalion 6th Marines and the 3rd Battalion, 4th Marines. Most of the 150,000 Army personnel had their 12-month tours extended as well. By July, 2007, the percentage of the mobilized Army deployed to Iraq and Afghanistan was almost 30%; the percentage of the mobilized Marine Corps deployed to Iraq and Afghanistan was 13.5%. Operations The plan began with a major operation to secure Baghdad, codenamed Operation Fardh al-Qanoon (Operation Imposing Law), which was launched in February 2007. However, only in mid-June 2007, with the full deployment of the 28,000 additional US troops, could major counter-insurgency efforts get fully under way. Operation Phantom Thunder was launched throughout Iraq on June 16, with a number of subordinate operations targeting insurgents in Diyala and Al Anbar Governorates and the southern Baghdad Belts. The additional surge troops also participated in Operation Phantom Strike and Operation Phantom Phoenix, named after the III "Phantom" Corps which was the major US unit in Iraq throughout 2007. Counterinsurgency strategy Counterinsurgency strategy in Iraq changed significantly under the command of General Petraeus since the 2007 troop surge began. The newer approach attempted to win the hearts and minds of the Iraqi people through building relationships, preventing civilian casualties and compromising with and even hiring some former enemies. The new strategy was population-centric in that it focused in protecting