During this period of his career, he attended both the Army Command and General Staff College and the National War College, earning master's degrees in military art and national strategic studies. Promoted to brigadier general in August 2001, Dempsey first served in the Kingdom of Saudi Arabia training and advising the Saudi Arabian National Guard. In June 2003, then Major General Dempsey assumed command of the 1st Armored Division. He succeeded Ricardo S. Sanchez who was promoted to lieutenant general, as commander of V Corps. Dempsey's command of the 1st Armored Division lasted until July 2005 and included 13 months in Iraq, from June 2003 to July 2004. While in Iraq, 1st Armored Division, in addition to its own brigades, had operational command over the 2nd Armored Cavalry Regiment and a brigade of the 82nd Airborne Division; the command, called "Task Force Iron" in recognition of the Division's nickname, "Old Ironsides", was the largest division-level command in the history of the United States Army. It was during this time that the U.S. intervention in Iraq changed dramatically as Fallujah fell to Sunni extremists and supporters of Muqtada al-Sadr built their strength and rose up against American forces. Then Major General Dempsey and his command assumed responsibility for the area of operations in Baghdad as the insurgency incubated, grew, and exploded. General Dempsey has been described by Thomas Ricks in his book "Fiasco": "In the capital itself, the 1st Armored Division, after Sanchez assumed control of V Corps, was led by Maj. Gen. Martin Dempsey, was generally seen as handling a difficult (and inherited) job well, under the global spotlight of Baghdad." On March 27, 2007, Lieutenant General Dempsey was transferred from commander of Multi-National Security Transition Command-Iraq, and reassigned as deputy commander of U.S. Central Command at MacDill Air Force Base, Florida. On February 5, 2008, Dempsey was nominated to head the U.S. Army, Europe/Seventh Army, and was nominated for promotion to four-star general upon Senate approval. On March 11, 2008, Dempsey's commander, Admiral William J. Fallon, retired from active service. U.S. Secretary of Defense Robert Gates accepted this as effective on March 31. Dempsey took over command as acting commander of Central Command. On March 13, 2008, Dempsey was confirmed by the United States Senate as Commander, U.S. Army, Europe/Seventh Army. However, due, to Admiral Fallon's unexpected retirement, Dempsey never took command of U.S. Army, Europe/Seventh Army.