The CIA supports the overall U.S. government effort to combat international terrorism by collecting, analyzing, and disseminating intelligence on foreign terrorist groups and individuals.
The CIA does neither. Executive Order 12333, as amended, explicitly prohibits the CIA from engaging, either directly or indirectly, in assassinations. Internal safeguards and the congressional oversight process assure compliance.
Technically, you could say CIA headquarters is in both. “Langley” is the name of the McLean neighborhood in which the CIA resides.