 Complete the following phrase:  Most recently, the Marines have served prominently in the Iraq War as part of Operation Iraqi Freedom. The I Marine Expeditionary Force, along with the Armys 3rd Infantry Division, spearheaded the 2003 invasion of Iraq and received the Presidential Unit Citation, the first time a Marine unit has received that award since 1968. The Marines left Iraq in the fall of 2003, but returned for occupation duty in the beginning of 2004. They were given responsibility for the Al Anbar Province, the large desert region to the west of Baghdad. During this occupation, the Marines spearheaded both assaults on the city of Fallujah in April Operation Vigilant Resolve and November 2004 