So here's the REAL story:

Ambassador Stevens was sent to Benghazi to secretly retrieve US made Stinger Missiles that the State Dept had supplied to Ansar al Sharia in Libya WITHOUT Congressional oversight or permission.

Sec State Hillary Clinton had brokered the Libya deal through Ambassador Stevens and a Private Arms Dealer named Marc Turi, but some of the shoulder fired Stinger Missiles ended up in Afghanistan where they were used against our own military. On July 25th, 2012, a US Chinook helicopter was downed by one of them. Not destroyed only because the idiot Taliban didn't arm the missile. The helicopter didn't explode, but it had to land and an ordnance team recovered the missile’s serial number which led back to a cache of Stinger Missiles kept in
Qatar by the CIA.

“What does it matter now?”