Tairod Nathan Webster Pugh, of New Jersey, was indicted yesterday on charges of attempting to provide material support to a terrorist group and obstruction of justice.
He was in custody and will appear Wednesday in federal court in New York City. His lawyer did not immediately respond to a message seeking comment.
The 47-year-old Pugh served in the Air Force as an avionics instrument system specialist from 1986 to 1990, and received training in the installation and maintenance of aircraft engines and navigation and weapons systems, according to federal prosecutors.
Prosecutors said he had been fired from his most recent job and decided to join the terror group, travelling from Egypt to Turkey to ultimately cross the border into Syria.
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He was stopped at the Turkish border and was turned away, they said.
A search of his laptop and other devices turned up jihadist propaganda videos, and a letter that says "I will use the talents and skills given to me by Allah to establish and defend the Islamic States," prosecutors said.
Federal officials have been concerned about Americans going overseas to train with these groups and returning with plots to carry out attacks at home.
"We will continue to vigorously prosecute extremists, whether based here or abroad, to stop them before they are able to threaten the United States and its allies," US Attorney Loretta Lynch said in a statement today.
Three men were arrested late last month in a plot to travel to Syria; they have pleaded not guilty.