From Cradle to Grave: The Lifecycle of Foreign Fighters in Iraq and Syria | Combating Terrorism...

"CTC has assembled a large dataset on foreign fighters in Iraq and Syria with the goal of filling these existing gaps. We defined foreign fighters as individuals who left or attempted to leave their home country and participated in actual fighting in the ranks of a local sub-state entity. As a result of the CTC’s collection effort, researchers compiled an open source list of close to 1,200 individuals. This project was initiated prior to the CTC’s acquisition of over 4,000 Islamic State personnel records, and due to the different source and scope of the data a decision was made to keep this effort completely distinct from the CTC’s work on those documents, which can be found in its April 2016 report, The Caliphate’s Global Workforce."