U.S. Embasies and Consulates and Marines

On the anniversary of 9/11 the U.S. experienced attacks on U.S. soil again, in Egypt and in Libya.  Coincidence?  I doubt it.  These were planned attacks resulting in the death of the Ambassador to Libya and three other Americans.  It now looks like the hired security (Libyians) ratted them out to the mob.  What ever happened to the practice of U.S. Marines staffing those posts and providing security???  As soon as the mob breached the wall they were invaders and should have been shot.