Tairod Nathan Webster Pugh, 48, was stopped at a Turkish airport in January 2015. He told investigators he was just on a vacation, but an indictment alleged that he was carrying 180 jihadist propaganda videos, including one featuring the beheading of an Islamic State prisoner. Later, prosecutors said they found a letter on his computer in which he told his wife he wanted to join the Islamic State.
The Justice Department said it has pressed criminal charges against more than 70 Islamic State sympathizers, though some published reports have put that figure higher.
Karen J. Greenberg, director of the Fordham Law School's Center on National Security, which tracks terrorism cases, said the U.S. Government has charged 78 people in connection with the group. Of those, two dozen have pleaded guilty.
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Authorities said two of Kareem's associates were killed when they brought semiautomatic rifles, bulletproof vests and an Islamic State flag to the event. Kareem's lawyer, blaming the government's "overactive imagination," told jurors Kareem had no knowledge the attack was to occur.
Other cases are moving closer to trial, including in Minneapolis, where several members of Minnesota's Somali community are scheduled for trial in May on charges that they plotted to join Islamic State fighters.
Pugh served in the Air Force from 1986 to 1990 after being trained to install and maintain aircraft engines and navigation and weapons systems. The airman first class worked in July 1987 at the Woodbridge Air Base in England before moving to the Davis-Monthan Air Force Base in Arizona in July 1989. After leaving the military, he worked as an avionics specialist and mechanic for companies in the Middle East and US.