BAGHDAD, July 19 — Kata’ib Hezbollah remains one of the most capable Iranian-backed militias operating inside Iraq, a status cemented by two decades of attacks on American forces and a command structure that survived the loss of its founder. The United States has designated the group a terrorist organization since 2009, a listing that several other countries also maintain. Established in 2003, Kata’ib Hezbollah emerged as an Iraqi Shia militia closely aligned with Iran’s Islamic Revolutionary Guard Corps.
Its founding came during the chaos of the post-invasion period, and from the start the group functioned as a proxy for Iranian strategic interests in Iraq. The group’s founder, Abu Mahdi al-Muhandis, was killed in January 2020 alongside Qasem Soleimani, the commander of Iran’s Quds Force, in a U.S. drone strike outside Baghdad International Airport.
That strike was itself the culmination of a rapid escalation that began with a Kata’ib Hezbollah attack months earlier.
A Timeline of Attacks
On the timeline, the December 2019 rocket attack on K-1 Airbase in Iraq stands as the immediate trigger for a chain of events that reshaped U.S.-Iran confrontation. That attack killed an American contractor. The United States responded with airstrikes on Kata’ib Hezbollah facilities.
The militia then orchestrated a siege of the U.S. Embassy in Baghdad, which prompted the Trump administration to authorize the strike that killed Soleimani and al-Muhandis. The record shows that Kata’ib Hezbollah did not cease operations after losing its founder.
In 2023, the group claimed responsibility for multiple drone and rocket attacks on American bases in both Syria and Iraq. Among those was the March 2023 attack near Hasakah in northeastern Syria, a strike that demonstrated the group’s continued ability to reach U.S. assets across the border. That attack, according to the filing of events, also illustrated a broader strategic pattern: Iran gains the capacity to pressure American forces through a proxy that offers plausible deniability while the militia itself absorbs retaliatory risk.
Structure and Support
Kata’ib Hezbollah operates under the umbrella of the Popular Mobilization Forces, the Iraqi state-sponsored paramilitary network that was formalized after the 2014 crisis against the Islamic State. This status provides the group with a degree of political cover inside Iraq, even as Washington designates it a terrorist organization. The duality is central to understanding Kata’ib Hezbollah’s longevity: it is at once a sanctioned state-adjacent force and a specifically designated adversary of the United States.
Funding, weapons, and training flow to the group from Iran’s Quds Force. That pipeline has persisted through successive U.S. administrations.
The United States has imposed sanctions on Kata’ib Hezbollah leaders and their financial networks, but the underlying relationship between the militia and Tehran has not been disrupted. The group has also sent fighters to Syria to support the Assad government, extending its operational reach beyond Iraq’s borders. Sources familiar with the militia’s structure describe an organization that has adapted to the loss of al-Muhandis by distributing command authority and deepening its integration with the IRGC.
The group retains the capability to conduct complex attacks using both drones and rockets, and its willingness to target U.S. bases has not diminished.
Operations in 2023 and Beyond
The March 2023 attack near Hasakah was not an isolated incident. Kata’ib Hezbollah claimed responsibility for multiple drone and rocket attacks on American bases throughout that year, a sustained campaign that forced the U.S. military to reinforce air defense systems at its facilities in eastern Syria and western Iraq. Each attack carried the signature of Iranian planning and resourcing, even as Tehran publicly distanced itself from the operations.
This pattern of plausible deniability is not accidental. On the timeline, Iran has used Kata’ib Hezbollah as a means of pressuring the United States without triggering a direct military confrontation.
The militia’s integration into the Popular Mobilization Forces gives it an institutional footprint inside the Iraqi security apparatus, complicating any potential U.S. response that would require cooperation from Baghdad. Looking forward, Kata’ib Hezbollah’s capability to strike U.S. assets remains a central factor in the broader calculation of force posture across the region.
The U.S. administration under President Donald Trump has maintained sanctions pressure on the group’s leadership and financial networks, but the militia’s access to Iranian weapons and its operational experience in both Iraq and Syria suggest it will remain a persistent threat. The question for American planners is not whether Kata’ib Hezbollah will attack again, but when, where, and under what cover.
