"Harroun said... al-Nusra fighters would ask him why the United States designed them as terrorists, " the complaint said.
Eric Harroun, 30, served in the US Army from 2000-2003, and allegedly fought in Syria with the al-Nusra Front.
Mr Harroun was medically discharged from the Army in 2003 after a car accident and lived in Phoenix, Arizona.
BBC: Ex-US soldier who 'fought in Syria' could face execution
If convicted, Mr Harroun would face a maximum sentence of life in prison.
An FBI affidavit says Harroun crossed into Syria in January 2013 and fought against Syrian President Bashar al-Assad's forces.
CNN: U.S. ex-soldier charged with using RPG for al Qaeda group
Joe Harroun, a consultant at commodities broker Advance Trading in Bloomington, Ill.
Eric Harroun, 30, of Phoenix was arrested Tuesday night by the FBI at a hotel near Washington Dulles International Airport in Virginia.
CNN: U.S. ex-soldier charged with using RPG for al Qaeda group
Harroun appeared Thursday in federal court in Alexandria, Virginia, and was charged in connection with his alleged use of a rocket-propelled grenade in Syria.
CNN: U.S. ex-soldier charged with using RPG for al Qaeda group
Harroun served with the U.S. Army from 2000 to 2003.
CNN: U.S. ex-soldier charged with using RPG for al Qaeda group
According to a criminal complaint, Mr Harroun is accused of crossing into Syria in January 2013 and fighting alongside members of Jabhat al-Nusra (the Nusra Front) against Mr Assad's forces.
According to the court records, Mr Harroun said he initially was fighting with the Free Syrian Army but jumped on an al-Nusra truck after a joint attack on a Syrian army camp.
Last year, the public defenders' office in the district where Mr Harroun will be tried represented a man who pleaded guilty to spying on US-based Syrian dissidents on behalf of the Assad regime.
The Pentagon declined to comment on Harroun's arrest.
CNN: U.S. ex-soldier charged with using RPG for al Qaeda group
The WMD law also applies to "any national of the United States who, without lawful authority, uses or threatens, attempts, or conspires to use a weapon of mass destruction outside of the U.S.." In March 2013, former U.S. soldier Eric Harroun was charged under this part of the statute for allegedly conspiring to use a rocket propelled grenade while fighting with an al Qaeda affiliated group in Syria.
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