Technically, Eric Harroun, a U.S. Army veteran who joined the rebellion in Syria, has only been charged with using a “destructive device.” (More on him in a second.) But U.S. law isn’t particularly diligent about differentiating dangerous weapons from apocalyptic ones. The affidavit of FBI agent Paul Higginbotham undergirding Harroun’s recent arrest and charge sums it up like this: “There is probable cause to believe that, in or about January 2013 to March 2013, Eric Harroun conspired to use a weapon of mass destruction, i.e. a Rocket Propelled Grenade, outside of the United States, in violation of 18 U.S.C. 2332a(b).”