Before the 2003 U.S.-led invasion of Iraq, the future Carabinieri and Portuguese Guarda Nacional Republicana headquarters was the Nasiriyah Chamber of Commerce, a three-story structure near the Euphrates River. The first U.S. forces to occupy the building were Marines from the 15th Marine Expeditionary Unit, who were later relieved by reservists from the 2nd Battalion 25th Marines.