Those things cost MONEY.
http://www.commondreams.org/views07/0319-26.htm<snip>
Post-invasion, the U.S. military established 110 bases in Iraq. By spring 2006 the Pentagon had “reduced the size of its footprint” by consolidating them into approximately 75 bases across the country. As authority is turned over to the central government in Baghdad or seized by competing Shi’a, Sunni, and Kurdish mini-states, the Pentagon is working feverishly to further consolidate the U.S. military presence to 14 “enduring bases” in Northern Iraq (Kurdistan), Baghdad, Anbar province (home to Sunni Fallujah, Ramadi, and Tikrit), and Shi’a-dominated southern approaches to Baghdad.
Organized around airfields “to facilitate resupply operations and troop mobility,” the major bases in Baghdad include: Camp Victory at the airport, which hosts as many as 14,000 U.S. troops; Anaconda Air Base, just north of Baghdad, which spreads across 15 square miles and is being built for 20,000 U.S. troops; Camp Falcon / Al Sarq, which will accommodate 5,000 U.S. soldiers; and the so-called U.S. “embassy complex” in the Green Zone. There, $1 billion is being spent on a 100-acre installation, comparable to the size of Vatican City, with a Marine barracks, 300 homes, 21 other buildings, and its own electrical, water, and sewage systems.
“Post Freedom,” Camp Marez, and the Mosul Airfield serve the 101st Airborne Division and defend U.S. allies and interests in oil-rich Kurdistan. “Camp Renegade” is an air base “strategically located near the Kirkuk oil fields and the Kirkuk refinery and petrochemical plant.” Tajji, just north of Fallujah, is built on the site of a former Republican Guard “military city” and is replete with the comforts of Burger King, Pizza Hut, and Subway restaurants to make U.S. warriors feel right at home. Camps Speicher and Fallujah are located near Saddam Hussein’s home town of Tikrit and the center of Sunni resistance in Fallujah. Little is known about the other planned “enduring bases.”
How much of this imperial infrastructure will survive the United States’ inevitable defeat in Iraq and the attendant negotiations is anyone’s guess. The peace movement is not alone in calling on the U.S. government to renounce any intention of maintaining bases in Iraq. Both houses of Congress voted last year to declare that the U.S. will not maintain permanent military bases, but this language disappeared from the final legislation. Former President Jimmy Carter and editorial writers across the country have appealed to the Bush-Cheney government to rule out permanent military bases. And, in their Out of Iraq: A Practical Plan for Withdrawal Now former presidential candidate George McGovern and former national crisis manager William Polk warn that “absent an American withdrawal and deactivation of the military bases, the insurgency will almost certainly continue.”