According to persons who reside near Langley, a large contingent of Marines arrived at CIA Headquarters in tilt-rotor aircraft and when the Marines deplaned, they were armed and moved quickly into CIA Headquarters! (I did not personally witness this and am relying solely on what witnesses are telling me)
Those witnesses also say that a significant number of tilt-rotor aircraft could be clearly seen circling the grounds of CIA Headquarters, parked on the grass around the building.
In an update on 20 November 2017, Turner said he was told:
Someone in the Pentagon/Military . . . . no one will say who . . . made a direct show of force to the CIA on Saturday. It was, for lack of a better description, the sending of a message from the military to the CIA: knock it off.