Its purpose was observation. Don’t know who was controlling it.
So it took 'pictures'? It had to be an overt order to send that drone to hover over Benghazi. IF it took pictures it would observe 'road' and 'water' traffic. Those terrorist did leave the scene of the crime. Where did they go after they robbed, murdered Americans and burned an American mission?
And wasn't a second unarmed drone offered as 'help'? Did it in fact get sent?