America Has Left Iraq

The American military presence in Iraq has finally reached a formal endpoint.

On September 30, U.S. forces completed their departure from Erbil Air Base, bringing an end to Operation Inherent Resolve in Iraq, the international coalition mission launched in 2014 to defeat the Islamic State after the group seized large areas of Iraq and Syria. The United States has now shifted from a military mission inside Iraq toward a bilateral defence relationship with Baghdad, while the coalition’s headquarters has moved to Jordan and counter-ISIS operations continue in Syria.

The significance goes far beyond the departure of troops.

The American military first entered Iraq in force in 2003, when the United States-led invasion removed Saddam Hussein’s government. More than two decades later, the final American military personnel are leaving a country that has undergone invasion, insurgency, civil war, the rise and territorial defeat of ISIS, years of U.S.-Iran confrontation and repeated attempts to build a stable political system.

The withdrawal therefore closes one chapter of Iraq’s modern history while opening another.

And the central question is no longer why America went into Iraq.

It is what happens now that America is leaving.

The Mission That Began With ISIS Is Ending

The most recent U.S. military mission in Iraq was fundamentally different from the 2003 invasion.

In 2014, ISIS captured large portions of Iraq and Syria, including Mosul, Iraq’s second-largest city. The speed of the group’s expansion created an international security crisis, prompting the United States and its partners to establish Operation Inherent Resolve.

The coalition provided air power, intelligence, training, logistics and military assistance to Iraqi forces and Kurdish Peshmerga units.

Over the following years, ISIS lost the territory it had controlled.

The Iraqi government declared victory over the group’s territorial presence in 2017, although ISIS never completely disappeared as an underground organization.

The U.S. military’s formal mission has therefore been transitioning for years.

Washington and Baghdad agreed on a timetable for ending the coalition’s military mission, with security responsibility progressively transferred to Iraqi forces.

That process has now reached its final stage.

The Pentagon says Iraqi security forces and Kurdish Peshmerga have secured the enduring territorial defeat of ISIS in Iraq and are positioned to take primary responsibility for national security.

But territorial defeat and permanent disappearance are not the same thing.

That distinction will be central to what happens next.

Iraq Is Now Responsible for Its Own Security

The most immediate consequence is straightforward.

Iraq has to carry more of the security burden itself.

The Iraqi government has welcomed the withdrawal as a restoration of sovereignty and a transition toward normal bilateral relations with coalition countries. Iraqi officials have repeatedly described September 30 as a milestone in ending the international coalition’s military presence and moving toward direct state-to-state cooperation.

This is politically important for Baghdad.

For years, the presence of foreign forces has been a deeply sensitive issue in Iraq.

Some Iraqis viewed the coalition as necessary assistance against ISIS, while others regarded continued foreign military presence as incompatible with Iraqi sovereignty.

The end of the coalition mission allows the government to present the country’s security architecture as increasingly Iraqi-led.

But sovereignty also brings responsibility.

Iraqi forces must now provide the intelligence, surveillance, air defence, counterterrorism capabilities and rapid-response capacity that foreign forces previously supplied in various forms.

The United States is not disappearing from the relationship altogether.

The two countries are moving toward a bilateral defence partnership, and U.S. officials have emphasized that the end of the coalition mission does not mean the complete end of security cooperation.

The difference is that cooperation will increasingly take place without a large U.S.-led military structure operating inside Iraq.

Iran Is Watching Closely

The geopolitical implications become much larger when Iran enters the picture.

Iraq occupies an extraordinary position between Iran, the Gulf states, Syria and Turkey.

It is also home to powerful political and armed groups that maintain varying degrees of alignment with Tehran.

The departure of U.S. forces therefore changes the balance in a country where Washington and Tehran have competed for influence for years.

Reuters reported that Iranian officials and Iran-aligned militias have portrayed the U.S. withdrawal as a strategic victory, while some Iraqi and Kurdish officials have expressed concern that Iran-backed groups could gain greater room for manoeuvre.

That does not mean Iraq is simply becoming an Iranian-controlled state.

Iraq has its own political institutions, security forces, economic interests and relationships with Arab states, Turkey, the United States and Europe.

But the disappearance of U.S. military forces removes one significant external counterweight.

The balance among Iraq’s domestic political factions could therefore become increasingly important.

The Militias Are the Hardest Question

One of the biggest unresolved issues is the future of armed groups that operate outside the conventional structure of the Iraqi military.

Iraq’s security landscape includes the Popular Mobilization Forces, or PMF, a state-recognized umbrella organization containing numerous armed factions with different political and ideological orientations.

Some factions have close relationships with Iran.

The Iraqi government has sought to maintain these groups within the formal state security framework while also confronting questions about their autonomy and weapons.

The U.S. withdrawal makes that issue more complicated.

Washington has long regarded some Iran-aligned Iraqi militias as threats to U.S. forces and interests.

With American troops gone, the immediate military confrontation between U.S. forces and those groups inside Iraq could diminish.

But the underlying political question remains:

Who ultimately controls armed force inside the Iraqi state?

That question will become increasingly important if Baghdad attempts to consolidate authority over all armed formations.

The ISIS Question Has Not Disappeared

The other major security concern is ISIS.

The group no longer controls cities and territory in Iraq as it did at its peak.

But an organization does not need to hold territory to remain dangerous.

ISIS has maintained underground networks, sleeper cells and insurgent capabilities in Iraq and Syria.

The U.S. withdrawal could therefore change how Iraqi forces confront the remaining threat.

The British government, announcing the end of its own participation in the coalition mission, said Iraqi Security Forces and Kurdish Peshmerga had secured the territorial defeat of Daesh and were positioned to assume primary responsibility for Iraq’s security.

That is the formal assessment behind the transition.

The concern is whether Iraq can maintain that level of security over the long term without the same degree of American intelligence, surveillance and logistical support.

Reuters reported concerns among some Iraqi and Kurdish officials that reduced U.S. support could create opportunities for ISIS sleeper cells to become more active.

The threat therefore becomes a test of Iraq’s institutional capacity rather than simply a question of American military presence.

Kurdistan Faces a Different Reality

The withdrawal is particularly significant for Iraq’s Kurdistan region.

Kurdish forces played a major role in the campaign against ISIS and have maintained close military ties with the United States.

The Kurdish region also sits close to several complicated security frontiers, including areas affected by ISIS remnants, Iranian-linked armed groups and tensions involving Turkey.

Reuters reported that Kurdish officials have expressed concerns about the security implications of the American departure, particularly because U.S. forces have provided capabilities that are difficult for regional forces to replicate independently.

The Kurdish leadership must now manage its security relationship with Baghdad without the same American military presence acting as a physical buffer.

That could make negotiations between Erbil and Baghdad more consequential.

Issues including territory, oil revenues, federal authority and security control have remained unresolved between the two sides.

The American withdrawal does not directly settle any of those disputes.

It changes the environment in which they will be negotiated.

America Is Leaving Militarily, Not Economically

There is another side of the U.S.-Iraq relationship that is easy to overlook.

Military withdrawal does not mean Washington has lost all leverage in Iraq.

The United States remains deeply connected to Iraq’s financial system, particularly through the country’s oil revenues and dollar-based financial infrastructure.

Reuters reported on September 30 that Iraq’s oil income remains connected to an account at the Federal Reserve Bank of New York, a legacy of arrangements established after the 2003 invasion. Oil accounts for roughly 90% of Iraq’s government budget, making financial access an important part of the relationship between Baghdad and Washington.

That creates an unusual geopolitical situation.

The United States can withdraw troops while retaining significant economic influence.

Iraq can gain greater military sovereignty while remaining deeply connected to the global financial system in which Washington has considerable influence.

The post-withdrawal relationship will therefore not be defined simply by whether American soldiers remain inside Iraq.

It will be defined by finance, trade, intelligence, diplomacy, energy and security cooperation.

The Withdrawal Also Changes America’s Middle East Strategy

The timing matters.

The U.S. departure comes while the wider Middle East is experiencing severe strategic instability.

The United States and Iran remain locked in a major confrontation, while negotiations over the Strait of Hormuz and the wider conflict are continuing through intermediaries. Reuters reported on September 30 that Iran had received U.S. feedback on a proposed seven-day trust-building plan concerning the reopening of the Strait of Hormuz and broader de-escalation measures.

Against that backdrop, the U.S. military withdrawal from Iraq takes on an additional meaning.

Washington is reducing its military footprint in one of the countries where U.S.-Iran tensions have been particularly visible.

At the same time, the United States continues to operate militarily elsewhere in the region.

That means this is not necessarily a simple American departure from the Middle East.

It is a redistribution of military commitments.

The exact shape of that new strategy will become clearer over time.

Iraq Is Between Washington and Tehran

Iraq now faces a difficult balancing act.

It needs a functioning relationship with Washington because the United States remains important for investment, financial access, defence cooperation and international diplomacy.

At the same time, Iraq shares a long border with Iran and has extensive economic, political and social ties with its eastern neighbour.

Iranian influence is therefore a structural reality of Iraqi politics.

Baghdad cannot simply choose one side and eliminate the other relationship.

Its challenge is to maintain national decision-making while dealing with two much larger powers whose interests frequently collide.

The U.S. military withdrawal removes one of the most visible symbols of that competition.

But it does not remove the competition itself.

In some ways, the contest could become more political and economic after the military departure.

What Happens to the U.S.-Iraq Relationship Now?

The next phase is likely to be less about bases and more about bilateral institutions.

The Pentagon says the transition is toward a bilateral defence relationship.

That could involve military training, intelligence sharing, counterterrorism cooperation and defence planning without a large permanent U.S. military presence.

The distinction matters.

The end of Operation Inherent Resolve does not mean Washington has declared Iraq strategically irrelevant.

Instead, the relationship is being redesigned.

Iraq wants sovereignty and greater control over its security decisions.

The United States wants to maintain strategic access and cooperation while reducing the risks and costs associated with a permanent military deployment.

Those objectives can overlap.

But they can also collide.

The Memory of 2011 Is Still There

There is one historical precedent that inevitably hangs over the withdrawal.

In 2011, the United States withdrew its remaining combat forces from Iraq.

Three years later, ISIS had captured huge areas of the country.

That does not prove that the current withdrawal will produce the same result.

The circumstances are substantially different.

Iraqi security forces are more experienced.

ISIS no longer controls major Iraqi cities.

The Iraqi government has significantly greater institutional capacity than it did during the early years after the 2003 invasion.

And the United States is maintaining a military presence in neighbouring Syria while the coalition structure continues to operate from Jordan.

Nevertheless, the memory of the previous withdrawal explains why Iraqi and Kurdish officials are paying such close attention to what happens next.

The question is whether Iraq can prevent history from repeating itself under very different circumstances.

A New Middle East Map Is Taking Shape

The U.S. departure from Iraq is one part of a much larger transformation in Middle Eastern geopolitics.

For decades, American military power has been one of the most visible pillars of the regional security architecture.

Now Washington is increasingly relying on partnerships, bilateral arrangements, deterrence and selective deployments rather than maintaining the same kind of ground presence everywhere.

Meanwhile, Iran continues to possess extensive relationships with armed and political groups across the region.

Arab states are strengthening their own defence capabilities.

Turkey is expanding its regional role.

China has increased its economic and diplomatic engagement across the Gulf.

Russia remains involved in regional security calculations despite its own pressures elsewhere.

Iraq sits at the intersection of all these forces.

That makes what happens inside Iraq important well beyond its borders.

The End of a Military Era Does Not Mean the End of American Influence

The most important point about today’s withdrawal is that it should not be interpreted as the disappearance of the United States from Iraq.

The military mission is ending.

The relationship is changing.

Washington will retain diplomatic, economic and security connections with Baghdad, while Iraq will assume greater responsibility for its own national defence. The U.S. military’s counter-ISIS mission continues in Syria, with the coalition headquarters now based in Jordan.

For Iraq, the challenge is to turn greater sovereignty into greater state capacity.

For the United States, the challenge is to maintain influence without relying on a large military footprint.

For Iran, the withdrawal removes a major U.S. military presence from a neighbouring country where Tehran has substantial influence.

For the wider region, the consequences will depend on whether Iraq can prevent competition among domestic and external actors from becoming another cycle of armed confrontation.

The images of American forces leaving Iraq may therefore mark the end of one era.

But they do not answer what comes next.

That story is only beginning.