Question: The Lockheed A-12 was a reconnaissance aircraft built for which United States organization, by Skunk Works, an official pseudonym for Lockheed Martin's Advanced Development Programs (ADP), formerly called Lockheed Advanced Development Projects?
Sentence (from "Lockheed A-12"): The aircraft was designated A-12, the 12th in a series of internal design efforts for "Archangel", the aircraft's internal code name.
Relevant evidence: No