Source?
Here's a good question from Democratic Benjamin Cardin: How does the US make sure that weapons it pours into conflicts like the Libyan revolution don't spread to places like Algeria and beyond?
“We had a concerted effort to try to track down and find and recover ManPads” and other weapons in Libya, Clinton says.
Source: http://www.theguardian.com/world/2013/jan/23/clinton-testifies-congress-benghazi-live
The US has estimated Qaddafi had acquired ~20,000 manpads, many of which have “leaked” into the hands of various “rebel” or “freedom fighter”(terrorist?) groups.
http://www.stimson.org/images/uploads/Shapiro_Libya_Remarks.pdf