Terror threat

With spread of illicit arms, can anti-aircraft missiles be short-circuited?

 As the United States abandons large commitments of ground troops in favor of arming and assisting allied forces, fighters such as Kurdish peshmerga in Iraq and rebels in Syria have increasingly made use of American-made weaponry — mostly small arms. Absent from their shipments, however, have been the shoulder-fired surface-to-air missiles, known as MANPADS, that Syrian rebels, at least, have long requested.