Marines weren’t there as guards.
http://www.cnbc.com/id/49009776
I read later that one of the casualties was an ex-Seal, in country as contractor to Uncle Sam to try and track down the missing Stingers etc.
snip-
Libyan Deputy Interior Minister Wanis al-Sharif said Stevens and another diplomat died in the first series of incidents around the consulate
I don't believe this. They are blowing smoke to coverup what actually happened.