The United States transferred its last base in the Al Anbar Governorate to the Iraqi government, ending the Anbar campaign.

Al Anbar Governorate, or Anbar Province, is the largest governorate in Iraq by area. Encompassing much of the country's western territory, it shares borders with Syria, Jordan, and Saudi Arabia. The population is mostly Sunni Arabs. The provincial capital is Ramadi; other important cities include Fallujah, Al-Qa'im and Haditha.

The Anbar campaign consisted of fighting between the United States military, together with Iraqi security forces, and Sunni insurgents in the western Iraqi governorate of Al Anbar. The Iraq War lasted from 2003 to 2011, but the majority of the fighting and counterinsurgency campaign in Anbar took place between April 2004 and September 2007. Although the fighting initially featured heavy urban warfare primarily between insurgents and U.S. Marines, insurgents in later years focused on ambushing the American and Iraqi security forces with improvised explosive devices (IEDs), large scale attacks on combat outposts, and car bombings. Almost 9,000 Iraqis and 1,335 Americans were killed in the campaign, many in the Euphrates River Valley and the Sunni Triangle around the cities of Fallujah and Ramadi.