A U.S. Air Force veteran and former airplane mechanic charged with attempting to join the Islamic State group in Syria pleaded not guilty Wednesday to terrorism charges.

A bearded Tairod Nathan Webster Pugh, wearing prison-issued khaki pants and a blue short-sleeved shirt, repeated his full name when asked but said nothing else before Eastern Distirct Judge Nicholas Garaufis. His attorney, Michael Schneider of the Federal Defenders of New York, entered the plea on his behalf. He declined to address reporters after the brief court appearance.