The transfer of more than 5,700 ISIS detainees from Syria to Iraq, completed under U.S. Central Command coordination, was preceded and enabled by an intelligence support operation that the National Counterterrorism Center has now described publicly. NCTC’s role was not incidental. The center provided the threat assessments, detainee vetting data, and cross-agency coordination that made the physical transfer negotiable and operationally executable. Without a consistent intelligence picture of who the detainees were, what networks they connected to, and what risks their relocation posed, the transfer would have been a security liability rather than a counterterrorism success.