An "embassy" or a base of operations...

The new US 'embassy' in Iraq: 21 buildings on 104 fortified acres
http://www.unknownnews.org/0604180414theUSembassy.html

"BAGHDAD, Iraq -- The fortress-like compound rising beside the Tigris River here will be the largest of its kind in the world, the size of Vatican City, with the population of a small town, its own defense force, self-contained power and water,..."

..."It's somewhat self-evident that there's going to be a fairly sizable commitment to Iraq by the U.S. government in all forms for several years," he said in Washington."

- Vox