A former CIA director has called them “our worst nightmare.” A 2005 study found that just one could blow a $15-billion hole in the world economy. And the Obama Administration is thinking about sending them to Syria. MoreThree Reasons the New Ukraine Deal May Not LastObama Signs Bill Barring Terrorist AmbassadorsMen Charged With Toppling Ancient Rock Formation Avoid Jail Time Huffington PostHere's An Updated Tally Of All The People Who Have Ever Died From A Marijuana Overdose Huffington PostMiss America Asks School Not to Punish Boy Who Asked Her to Prom PeopleThey are shoulder fired anti-aircraft missiles, capable of knocking helicopters and low-flying planes out of the sky.