>I read it. It supports me, not you.
From http://www.law.cornell.edu/uscode/html/uscode08/usc_sec_08_00001481——000-.html
His citizenship can be revoked “if and when he is convicted thereof by a court martial or by a court of competent jurisdiction.”
He wasn’t tried, wasn’t convicted and was still a US Citizen.
(3) entering, or serving in, the armed forces of a foreign state if
(A) such armed forces are engaged in hostilities against the United States, or...
Al-Qaeda claims to be part of the new Khalifate. Therefore a state or a political subdivision thereof.
Further down:
...Any person who commits or performs, or who has committed or performed, any act of expatriation under the provisions of this chapter or any other Act shall be presumed to have done so voluntarily,...
As I said, no trial is needed in this case.
He also comes under (2).