The United States military has completed its final withdrawal from Iraq, bringing an end to more than two decades of continuous military presence that originated with the 2003 invasion. The historic pullout, finalized on September 30, 2026, marks a pivotal shift in Middle Eastern geopolitics. However, security analysts and former defense officials have raised immediate concerns that the departure could create a dangerous security vacuum, empowering Iranian influence and offering an opening for an ISIS resurgence across the region.
Retired Army Lt. Gen. H.R. McMaster warned on the day of the final departure that the complete exit of American forces risks destabilizing the region. McMaster, who previously directed national security policy during Donald Trump’s presidency and commanded counterinsurgency units in Iraq, argued that the military transition occurs at a precarious time as broader conflicts involving Israel and Iran intensify.
The Final Stages of the U.S. Withdrawal from Iraq
U.S. Central Command confirmed that the last remaining American forces vacated Erbil Air Base in Iraq’s semi-autonomous Kurdish region, following the earlier withdrawal of the majority of U.S. forces from central Iraq. The anti-ISIS coalition previously headquartered in Iraq is shifting its command base to Jordan, while ongoing counterterrorism operations continue in neighboring Syria.
The U.S. deployment in Iraq has seen multiple phases over the past 23 years. After the initial 2003 invasion and the subsequent 2011 military exit, U.S. forces returned in 2014 at the invitation of the Iraqi government to spearhead the campaign against ISIS. Alongside Iraqi security forces and Kurdish fighters, the coalition territorially defeated the self-proclaimed caliphate by 2017. Approximately 4,500 American service members lost their lives during the two decades of conflict.
Strategic Concerns: Iranian Influence and Militia Pressure
Iraqi Prime Minister Ali al-Zaidi’s government has championed the departure as a milestone in restoring full national sovereignty, declaring a two-day national holiday dubbed “sovereignty day.” State television and security officials marked the transition with military parades in Baghdad, emphasizing the readiness of local security institutions.
Yet, regional rivals and Western policy experts view the exit through a different lens. Victoria Taylor, director of the Iraq Initiative at the Atlantic Council, noted that removing the U.S. military counterweight has long been a primary objective for Tehran. Iran and its aligned regional militias have openly celebrated the withdrawal as a major victory for their “axis of resistance.”
The Trump administration has maintained intense diplomatic pressure on Baghdad to disarm powerful Iran-backed paramilitary groups operating outside state control. While Prime Minister al-Zaidi initially agreed to a September 30 deadline to disarm these factions, he subsequently requested an extension until June 2027. Prominent militia groups have stated they refuse to surrender their weapons while they perceive Iraq as remaining vulnerable to external interference.
Vulnerabilities and the Threat of an ISIS Resurgence
Beyond geopolitical shifts involving Iran, military commanders have expressed grave apprehension regarding the counterterrorism capabilities of local forces in the absence of U.S. intelligence, logistical support, and drone surveillance.
Kurdish commander Sirwan Barzani reported heightened activity from ISIS sleeper cells in northern disputed territories immediately following the announcement of the coalition’s departure. Highlighting these ongoing risks, Iraqi special forces recently intercepted and neutralized suicide bombers in Alton Kupri near Kirkuk before they could execute coordinated attacks to coincide with the military exit.
While younger generations of Iraqis experience relative calm in major urban centers marked by active real estate development and commercial growth, security analysts warn that the hasty removal of foreign support could allow extremist networks to regroup and exploit existing regional vulnerabilities.
