Mohamad Khweis, a U.S. citizen who grew up near Washington, D.C., has been sentenced to 20 years in federal prison for successfully joining the Islamic State terror group.

A native of Alexandria, Virginia, Khweis is the first U.S. member of ISIS to be caught overseas, tried and convicted by jury.

Khewis flew out of Baltimore-Washington International Airport in December 2015 and ultimately ended up willingly residing in ISIS-controlled territory, according to federal prosecutors. He admittedly stayed at an ISIS safe house in Raqqa, Syria, the terror group’s former self-proclaimed capital, before being deployed to Iraq and captured in March 2016 by Kurdish peshmerga forces, prosecutors said previously.