U.S. forces set to leave Iraq after first arriving in 2003

U.S. forces are set to pull out from their last bases in Iraq by Wednesday, a departure celebrated as a victory by Iran and its allies who now have deep influence in the country where 4,500 Americans died during more than two decades of war.

U.S. troops originally left in 2011 but drawn back in after emergence of Islamic State

Thomson Reuters

· Posted: Sep 29, 2026 12:35 PM EDT | Last Updated: 28 minutes ago

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U.S. forces are set to pull out from their last bases in Iraq by Wednesday, a departure celebrated as a victory by Iran and its allies, who now have deep influence in the country where 4,500 Americans died during more than two decades of war.

Iraqi security experts say ‌the withdrawal — agreed in 2024 under President Joe Biden and carried out by Donald Trump's administration even as it wages war against Iran — could give Tehran and its powerful allies free rein, while also allowing other U.S. enemies to stage a comeback, including Islamic State.

Abu Mojtaba ​al-Yasiri, a commander in the Islamic Resistance in Iraq, an umbrella group of Iran-backed armed factions, described the U.S. withdrawal as "a historic victory for the Iraqi Islamic resistance groups and honourable Iraqis, and a crushing defeat for the American project."

"On Sept. 30, we will celebrate the turning of a black page in Iraq's history and the failure of the occupation to impose ​its will on our country," he told Reuters. "Iraq has proven that its sovereignty cannot be secured by foreign forces, but by the resistance and the will of its people."

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While the eventual departure of U.S. forces is ⁠broadly popular among Iraqis, those who worry about the strength of the Iran-backed groups fear the withdrawal is premature.

"We believe ‌Iraq is still not fully ready to take over the security file at this time," Abdulrahman al-Zobaie, a Sunni tribal leader in Fallujah, once a bastion of anti-American resistance, told Reuters.

"All Iraqis aspire to full sovereignty, and no Iraqi would dispute that. But I believe that the [U.S.-led coalition] leaving in this way and creating a vacuum is what all Iraqis fear."

Deadlier than U.S. deployment in Afghanistan

American forces invaded Iraq in 2003 to topple Sunni Muslim dictator Saddam Hussein, going on to occupy the country, install a Shia-led government and fight a years-long counterinsurgency before withdrawing at the end of 2011.

They returned less ⁠than three years later to help Iraqi forces defeat the Sunni militant group Islamic State, also known as ISIS at the time, in a major war from 2014 to 2017.

Around twice as many Americans died in "Operation Iraqi Freedom" as in the parallel war in Afghanistan, which ended with an abrupt U.S. withdrawal in 2021.

In recent years, Iraq has been the only country to maintain close political and military alliances with both the United States and Iran, which sometimes used Iraqi territory as a proxy battlefield.

The United States killed ‌a top Iranian commander, Qasem Soleimani, with a strike on Baghdad Airport in 2020. Iran's allies repeatedly fired on U.S. bases, sometimes drawing reprisals.

In this year's war against Iran, seven of the 18 U.S. service members listed as killed were in Iraq, the last an army sergeant who died during the controlled detonation of a drone at a base near Erbil in July.

Fears of imminent attacks

Iran, which says its ultimate aim is to force American forces to leave the entire Middle East, casts the U.S. withdrawal from Iraq as a victory for its "axis of resistance" of allied armed groups across the region.

"Lasting ​security will prevail in Iraq" once the Americans leave the country and the region, the deputy chairman of the National Security Commission of Iran's parliament, Amir Hayat Moqaddam, said on Monday.

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Iran "welcomes the withdrawal of American troops from Iraq and will undoubtedly support it," he told Iran's parliamentary news service. "Resistance groups are currently taking ⁠action, sometimes targeting and confronting American troops."

Washington has accused Iran-backed militia groups in Iraq of playing a role in the wider Middle East conflict by launching attacks on neighbouring countries at the direction of Tehran, most recently hitting ⁠a major Saudi oil pipeline this month. The Baghdad government says it is trying to curb their influence.

Some Iraqi security officials, both in the federal government and the semi-autonomous northern Kurdish ⁠region, say the U.S. ⁠pullout also risks giving new life to Islamic State fighters, who, despite the ​defeat of their self-proclaimed caliphate nearly a decade ago, retain a sleeper cell network.

At their height, the fighters occupied a third of Iraq and killed thousands of people, including hundreds they videotaped themselves gunning down inside a former U.S. ​military base.

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Iraqi security forces said a suspected Islamic State cell was preparing suicide attacks to coincide with the pullout. The plot highlighted concerns that the militant group remains capable of exploiting security gaps despite years of military setbacks, said four Iraqi security and army officials.

Islamic State "is seeking to send a message that the group is still powerful and capable of launching bloody attacks," said Col. ⁠Khalid al-Bayati, a senior security official in the strategic oil town ‌of Kirkuk.