Sinh Vinh Ngo Nguyen, 25,, pleaded guilty in December to one count of attempting to assist a known terrorist organisation.
"I simply do not understand how we can rehabilitate his commitment to die for his beliefs," US District Court Judge John F. Walter commented while discussing what potential threat Nguyen might pose after his release.
Nguyen shook his head no when the judge asked if he would like to make any remarks. Nguyen sat through the proceedings with his hands shackled at the waist, twiddling his thumbs.
The public defender also said there was very little expertise Nguyen could offer to a terrorist organisation. "He is not a skilled tactician," she said.
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Between August and October 2013, Nguyen met several times with a man he thought was an al-Qaida recruiter but who was actually working for the FBI, according to court documents. Nguyen told the phony recruiter he was born to wage jihad and he agreed to travel to Pakistan via Mexico in order to train 30 al-Qaida fighters.
Nguyen's admission was outlined in a plea agreement filed in federal court.
Nguyen, who also went by the name Hasan Abu Omar Ghannoum, said he had travelLed to Syria and for five months fought with rebel forces opposing the regime of Bashar al-Assad. While in Syria, Nguyen offered his services to al-Qaida but was turned down, according to federal prosecutors.