embarrassing when an employee with a top secret national security clearance secretly travels to syria and marylanrie terrorist. >> reporter: what's more stunning is how it ended. greene began cooperating with the fbi immediately upon her arrest. she pleaded guilty to making false statements involving international terrorism. the government said she skirted a line dangerously close to other more serious charges. the assistant u.s. attorney wrote, the nature and circumstances warrant serious punishment. similar cases have ended in sentences of eight, ten, 15 years in federal prison. greene was sentenced to just two. according to prosecutors, it was because of her cooperation. she's already out on probation but free. as for dennis, the german rapper turned isis soldier who married the fbi contractor, he remains at large and still a specially