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?

Context paragraphs:
Skunkworks: Skunk Works is an official trademark for the Lockheed Martin Advanced Development Programs (formerly Lockheed Advanced Development Projects).

Lockheed Martin Advanced Technology Laboratories: Lockheed Martin Advanced Technology Laboratories (ATL) is a department of Lockheed Martin, located in Cherry Hill, New Jersey, with approximately 220 employees.  Other locations include Westlake Village, California, Atlanta, Georgia, and Arlington, Virginia.  ATL specializes in advanced research and development and is analogous to the Lockheed Martin Aeronautics division's famous Skunk Works.

Lockheed A-12: The Lockheed A-12 was a reconnaissance aircraft built for the United States Central Intelligence Agency (CIA) by Lockheed's Skunk Works, based on the designs of Clarence "Kelly" Johnson.  The aircraft was designated A-12, the 12th in a series of internal design efforts for "Archangel", the aircraft's internal code name.  It competed in the CIA's "Oxcart" program against the Convair Kingfish proposal in 1959, and won for a variety of reasons.

Lockheed Martin X-55: The Lockheed Martin X-55 Advanced Composite Cargo Aircraft (ACCA) is an experimental twinjet transport aircraft.  It is intended to demonstrate new air cargo-carrier capabilities using advanced composite material.  A project of the United States Air Force's Air Force Research Laboratory, it was built by the international aerospace company Lockheed Martin, at its Advanced Development Programs ("Skunk Works") facility in Palmdale, California.

Lockheed SR-71 Blackbird: The Lockheed SR-71 "Blackbird" is a long-range, Mach 3+ strategic reconnaissance aircraft that was operated by the United States Air Force.  It was developed as a black project from the Lockheed A-12 reconnaissance aircraft in the 1960s by Lockheed and its Skunk Works division.  American aerospace engineer Clarence "Kelly" Johnson was responsible for many of the design's innovative concepts.  During aerial reconnaissance missions, the SR-71 operated at high speeds and altitudes to allow it to outrace threats.  If a surface-to-air missile launch was detected, the standard evasive action was simply to accelerate and outfly the missile.  The SR-71 was designed with a reduced radar cross-section.

Lockheed YF-12: The Lockheed YF-12 was an American prototype interceptor aircraft evaluated by the United States Air Force.  The YF-12 was a twin-seat version of the secret single-seat Lockheed A-12 reconnaissance aircraft, which led to the U.S. Air Force's Lockheed SR-71 Blackbird twin-seat reconnaissance variant.  The YF-12 set and held speed and altitude world records of over 2,000 mph (3,200 km/h) and over 80,000 ft (later surpassed by the SR-71), and is the world's largest manned interceptor to date.

Stark Industries: Stark Industries (NYSE: SIA, NASDAQ: STRK, fictional), later also known as Stark International, Stark Innovations, Stark/Fujikawa, Stark Enterprises and Stark Resilient, is a fictional company appearing in American comic books published by Marvel Comics.  The company is depicted as being owned and run by businessman Anthony Edward "Tony" Stark, also known as Iron Man.  It first appeared in "Tales of Suspense" #40 (April 1963) and was founded by Tony's father, Howard Stark.  According to Forbes 25 largest fictional companies it had an estimated sales of $20.3 billion, ranking it at number 16.  In the Marvel Cinematic Universe, Stark Industries has a logo similar to that of defense contractors Lockheed Martin and Northrop Grumman and is listed on the New York Stock Exchange as SIA.  During the press conference scene, Stark is seen entering a building that resembles the entrance to Lockheed Martin's Skunk Works facility.  An airplane extremely similar to the Lockheed YF-22 stood as a statue in front of the Stark Industries facility, exactly like the prototypes on display at Skunk Works facility in Palmdale, California.

Skunk Works: Skunk Works is an official pseudonym for Lockheed Martin's Advanced Development Programs (ADP), formerly called Lockheed Advanced Development Projects.  It is responsible for a number of famous aircraft designs, including the U-2, the Lockheed SR-71 Blackbird, the Lockheed F-117 Nighthawk, Lockheed Martin F-22 Raptor, and the Lockheed Martin F-35 Lightning II, which will be used in the air forces of several countries.  Its name was taken from the moonshine factory in the comic strip "Li'l Abner".  The designation "skunk works" or "skunkworks" is widely used in business, engineering, and technical fields to describe a group within an organization given a high degree of autonomy and unhampered by bureaucracy, with the task of working on advanced or secret projects.

Lockheed Martin Advanced Technology Labs: Lockheed Martin Advanced Technology Laboratories is a department of Lockheed Martin, in the Electronic Systems business unit, located in Cherry Hill, NJ, with approximately 400 employees.  Other locations include Westlake Village, CA, Atlanta, GA, Arlington, VA, and Vienna, VA.  ATL specializes in advanced research and development and is analogous to the Lockheed Martin Aeronautics division's famous Skunk Works.

Lockheed Martin Polecat: The Lockheed Martin Polecat (company designation P-175) was an unmanned aerial vehicle by Lockheed Martin.  It was developed by the company's Advanced Development Programs division in Palmdale, California. " Polecat" is a colloquialism for a skunk, in an apparent reference to the popular "Skunk Works" nickname for the Lockheed Martin's Advanced Development Programs division.

Supporting paragraphs: Lockheed A-12 Skunk Works
Answer: Central Intelligence Agency (CIA)