“Additional classified capabilities were deployed to the region,” Tidd said, in what other defense officials said was a reference to the deployment of special operations commandos.

Tidd was responding to a letter from Rep. Howard P. “Buck” McKeon (R., Calif.) about whether the military recommended bolstering security in Libya prior to the Sept. 11 attack that killed U.S. ambassador to Libya Chris Stevens and three other Americans.
A U.S. official would not provide details on the classified unit in the region but said it includes elite U.S. special operations commandos trained for counterterrorism missions, like the Navy’s Seal Team Six, known formally as the Naval Special Warfare Development Group.

The CIA also is said to be secretly setting up covert armed aerial drone units in the country.