The United States military achieved its objectives in the 2003 invasion of Iraq: the capture of Saddam Hussein, total air dominance within days, and the collapse of the Iraqi government in 21 days.
More than 20 years later, Iraq remains an authoritarian state with political parties deeply connected to Tehran. Iranian-backed militias operate openly within Iraq, some even holding official positions. The country, rebuilt at a cost of US$2 trillion and 4,488 American lives, is now firmly within the sphere of Iranian influence.
As an international security scholar, the pattern observed is that military success does not guarantee political success, and the gap between the two is where wars ultimately fail. This echoes a lesson from history, as recorded by Thucydides, who observed that empires capable of destruction often exhaust themselves by failing to plan for governance afterward.
The military and political ledger
Upon arriving in Baghdad in April 2003, L. Paul Bremer, head of the Coalition Provisional Authority, issued two orders. Order 1 dissolved the Baath Party and removed its members from positions of power. Order 2 disbanded the Iraqi army, leaving approximately 400,000 soldiers unemployed and armed.
These actions inadvertently provided a recruiting pool for the Sunni-led insurgency that followed. The logic behind dissolving the Baath Party – that a new Iraq could not be built with those who built the old one – proved catastrophic.
Countries are held together by organized coercion, not ideology. Destroying this infrastructure creates a power vacuum. In Iraq, Iran had been building its capacity since the 1980s, cultivating networks during and after the Iran-Iraq War to ensure a post-Saddam Iraq would not threaten its security.
The vacuum is not neutral
The fundamental flaw in American regime-change strategy is the assumption that destroying the existing order creates space for something better. In reality, it creates space for whoever is best organized, armed, and willing to fill it – in Iraq, that was Iran.
In Iran, the Islamic Revolutionary Guard Corps meets those criteria, controlling an estimated 30% to 40% of the Iranian economy and possessing a parallel state infrastructure. Since Ayatollah Ali Khamenei’s death, the Revolutionary Guard has taken effective control of decision-making. Mojtaba Khamenei, with ties to the Revolutionary Guard, was named supreme leader on March 8, 2026, representing continuity with the existing regime.
Dismantling the Revolutionary Guard would collapse the economy, while leaving it in place maintains the regime’s coercive power. Attempts at regime change in Libya demonstrate the dangers of creating a power vacuum. The Iranian opposition – the Mujahedeen-e-Khalq, monarchists, and democratic factions – lack domestic legitimacy.
Frequently Asked Questions
What were the initial objectives of the U.S. Military in Iraq in 2003?
The U.S. Military achieved decapitation of the regime with the capture of Saddam Hussein, total air dominance within days, and the collapse of the Iraqi government in 21 days.
What role did L. Paul Bremer play in post-invasion Iraq?
L. Paul Bremer arrived in Baghdad as head of the Coalition Provisional Authority and issued two orders: dissolving the Baath Party and disbanding the Iraqi army.
What group is currently best positioned to fill a power vacuum in Iran?
The Islamic Revolutionary Guard Corps is best positioned to fill a power vacuum in Iran, as it is organized, armed, and willing to do so.
Given these precedents, what lessons should policymakers consider when contemplating interventions in sovereign nations?
