U.S. Military Transfers ISIS Detainees Amid Kurdish Counterterrorism Shift
The U.S. military is relocating thousands of ISIS detainees from Syria to Iraq, effectively signaling the end of a Kurdish-led counterterrorism strategy. The hope is that a unified Syrian government can now hold the line against rising rebel threats.
This transfer aims to prevent mass defections from Kurdish-run facilities as the Syrian government assumes control over northeastern Syria. However, this situation raises concerns for the U.S. that go beyond just the immediate action against ISIS. If detainee management and security are mishandled during this transition, it could undermine the narrative of ISIS’s defeat, a milestone which was proclaimed by President Donald Trump in 2019 after U.S.-backed efforts dismantled ISIS’s territorial control.
Warnings from Iraqi intelligence indicate that ISIS has the potential to regain ground during this period of political and security change in Syria. Internal assessments suggest the group could consist of around 10,000 members, while United Nations estimates are notably lower, indicating about 3,000 Islamic State members in both countries by August 2025. This discrepancy highlights the uncertainty facing U.S. strategists, especially with the deterioration of detention facilities, shifting custody protocols, and rapid changes in regional authority.
According to Hamid al-Shatri, head of Iraqi intelligence, ISIS’s resurgence poses risks for Iraq. He noted that the group has escalated from 2,000 fighters to potentially 10,000 in just over a year. “This definitely threatens Iraq,” he said, emphasizing ISIS’s capacity to launch attacks across borders.
Brian Carter, a Middle East analyst, pointed out that Iraq’s concerns stem from Syria’s fresh leadership with Islamist ties. He thinks this will impact how Iraq evaluates threats coming from its neighbor. Although President Trump once announced ISIS’s defeat, the group has since regrouped as a rebel faction, maintaining sleeper cells throughout the region.
This was underscored by a recent attack where an ISIS-linked gunman killed two U.S. servicemen in Palmyra—marking the first American combat fatalities since the transition began in 2024. In retaliation, the U.S. launched Operation Hawkeye Strike, executing airstrikes on over 100 ISIS facilities.
For years, the U.S.-supported Syrian Democratic Forces (SDF) have been responsible for around 10,000 ISIS detainees. However, that system is now faltering. A new agreement led by U.S. Special Envoy Tom Barrack involves integrating the SDF into the Syrian National Army, necessitating rapid changes in how security is managed.
The end of Kurdish autonomy directly affects detention operations, especially as Syrian forces capture key facilities. U.S. military officials now regard the detainee transfer as essential to avoid significant security incidents.
“We’re collaborating closely with the Iraqi government,” said Gen. Brad Cooper of U.S. Central Command, following the transfer of high-risk fighters to Iraq. He described the process as vital for maintaining U.S. security.
Analysts caution that not all detainees are actual ISIS fighters, complicating matters. Years of mass arrests and inconsistent record-keeping mean that distinguishing between genuine terrorists and those captured for political reasons is challenging.
Up to 7,000 detainees are set for relocation, although conditions are still volatile. Recently, control over the Al-Hol refugee camp was completed, where 24,000 individuals reside. Kurdish forces reportedly withdrew due to “international apathy,” leaving Syrian authorities to manage the camp, raising concerns about how releases will be handled during this delicate transition.
Daniel Byman from the Center for Strategic and International Studies pointed out that, historically, chaos represents an opportunity for ISIS. “It’s not about their strength right now,” he explained. “But their ability to exploit disarray.”
Carter warned that failing to establish a ceasefire between the SDF and Syrian government could benefit ISIS. He noted that with the U.S. planning to withdraw its troops, a security vacuum may allow ISIS to resurge.
Interestingly, Carter sees some positives in this situation, asserting that moving detainees to nations capable of prosecuting them might be beneficial for U.S. interests. He mentioned that Iraq has more suitable prison facilities than those previously used by the SDF.
As the management of ISIS fighters becomes more distributed, local governments’ capabilities will likely determine the outcome. Byman indicated that a lack of regional investment in security reduces the effectiveness of allied coordination.
