U.S. Completes Iraq Troop Withdrawal as Security Landscape Shifts

What Happened

On September 30, 2026, the U.S. military completed the withdrawal of all remaining troops and equipment from Erbil Air Base in northern Iraq, marking the end of Operation Inherent Resolve. The withdrawal was announced earlier by President Donald Trump, who said U.S. troops would leave Iraq by the end of September, concluding a U.S. military presence that had been reestablished in 2014 after the 2011 pullout following the 2003 invasion that toppled Saddam Hussein. According to U.S. Central Command, approximately 1,500 American and coalition personnel had been stationed at Erbil to support counter‑ISIS operations before the pullback. The final movement of personnel and materiel was completed on the date specified in a 2024 Washington‑Baghdad agreement to wind down the mission. CENTCOM commander Admiral Brad Cooper praised the effort, stating that the tens of thousands of service members, diplomats, and civilians who served in Iraq had accomplished their mission. The departure transfers primary responsibility for Iraq’s security to Iraqi government forces while the U.S.-led task force relocates its headquarters to Jordan to continue counter‑ISIS work in Syria.

What the Evidence Establishes

The evidence confirms that the U.S. military presence in Iraq ended on September 30, 2026, with the evacuation of Erbil Air Base. Multiple statements from CENTCOM indicate that roughly 1,500 U.S. and coalition forces were based at Erbil supporting Operation Inherent Resolve prior to the withdrawal. The withdrawal followed a timeline agreed upon in 2024 between Washington and Baghdad under President Joe Biden’s administration, which aimed to wind down the mission after Iraqi officials assessed their security forces as increasingly capable. Defense Intelligence Agency assessments from summer 2026 judged that ISIS in Iraq ‘almost certainly remains severely degraded,’ limited to survival efforts and unable to exploit instability from the concurrent U.S.–Iran conflict. The same DIA reporting noted that Iran‑aligned militias had launched hundreds of attacks on U.S. forces and diplomatic facilities after the war with Iran began earlier in 2026. Additionally, a U.S. Army sergeant, Michael Emmanuel Swinton, age 30, was killed at Erbil in July 2026 during the controlled detonation of a downed Iranian attack drone, underscoring the persistent threat from militia‑affiliated weapons. After the pullback, CENTCOM confirmed that the Operation Inherent Resolve headquarters had moved to Amman, Jordan, and that U.S. forces would continue counter‑ISIS operations in Syria alongside coalition partners.

Where the Accounts Conflict

Conflicting narratives emerge regarding Iraq’s readiness to assume full security responsibility and the persistence of threats. President Trump and CENTCOM leadership asserted that Iraqi security forces, including the Peshmerga and other Kurdish units, now possess the capacity, leadership, and operational independence to manage threats unilaterally, declaring that ISIS no longer poses a systemic threat to Iraq’s national security. In contrast, Iraqi Prime Minister Ali al-Zaidi warned that powerful Iran‑backed militias operating outside state control remain armed and resistant to disarmament, arguing that the U.S. withdrawal removes a key justification for those groups to lay down weapons. The same Iraqi officials noted that the government has pushed back its disarmament timeline to June 30, 2027, after initially targeting the September 30, 2026 deadline. Furthermore, while the DIA assessed ISIS as severely degraded, earlier CENTCOM briefings in May 2026 reported a 70% decline in ISIS attacks since 2023, yet warned that the group retains latent capability. These tensions reveal a divergence between the U.S. framing of mission success and on‑the‑ground assessments of enduring militia and insurgent risks.

Context and Stakes

The U.S. military involvement in Iraq spans over two decades, beginning with the 2003 invasion that removed Saddam Hussein, followed by a withdrawal in 2011, and a return in 2014 after ISIS seized large territories in Iraq and Syria. Operation Inherent Resolve was launched to counter the ISIS threat, peaking with approximately 2,500 U.S. troops in Iraq as part of the coalition effort. Over the ensuing years, the mission evolved from direct combat to training, advising, and intelligence support for Iraqi forces, while the U.S. shifted logistical infrastructure out of Iraq, relocating the coalition headquarters to Jordan in 2026. The withdrawal coincides with a broader strategic shift as the U.S. faces a resurgent Iranian influence in Iraq through armed groups that have resisted disarmament efforts and possess rockets, missiles, drones, and, in some cases, air‑defense systems capable of threatening regional U.S. assets. The stakes for Iraq include the risk of renewed militia violence, potential ISIS resurgence if security gaps appear, and the challenge of integrating disparate armed factions under state control. For the United States, the pullback reduces force protection burdens but requires reliance on remote capabilities and regional partners to counter any future threats.

What to Watch Next

Analysts should monitor several developments in the coming weeks and months. First, the frequency and scope of attacks by Iran‑backed militias on Iraqi government facilities, Kurdish positions, and remaining U.S. or coalition assets in Jordan and Syria may increase as groups seek to fill the security vacuum left by the U.S. departure; any uptick in rocket, missile, or drone launches would be a key indicator. Second, progress toward the Iraqi government’s revised disarmament deadline of June 30, 2027, will be critical, particularly whether the 90‑day confidence‑building period announced by Prime Minister al-Zaidi leads to a measurable reduction in militia attacks. Third, ISIS activity should be tracked for signs of resurgence, especially in areas where Iraqi security capabilities remain limited, such as Diyala or Anbar provinces; a rise in IED explosions or assassinations would signal latent capability. Fourth, U.S. legislative and defense‑budget responses to the withdrawal, including potential funding shifts for special‑operations forces or intelligence assets focused on the Middle East, will indicate how the institutional posture adapts. Finally, diplomatic engagements between Washington, Baghdad, and Tehran concerning militia control and border security may shape the longer‑term stability of the region.

Bottom Line

The completion of the U.S. troop withdrawal from Iraq on September 30, 2026, fulfills a timeline set in 2024 and marks the end of a combat mission that began with the 2014 return to counter ISIS. While U.S. leadership emphasizes the degradation of ISIS and the increased capacity of Iraqi forces, credible evidence points to ongoing threats from Iran‑aligned militias that have resisted disarmament and retain sophisticated weaponry, as demonstrated by the July 2026 death of Sergeant Michael Emmanuel Swinton. The transfer of primary security responsibility to Iraq is therefore occurring amid a complex threat environment where both militant and terrorist risks persist. The outcome will depend on Baghdad’s ability to enforce its disarmament plan, the effectiveness of U.S. over‑the‑horizon capabilities from Jordan, and the resilience of Iraqi security forces against resurgent challenges. Continued vigilance and adaptive strategies will be necessary to prevent a deterioration that could necessitate a renewed U.S. military footprint.