The Agena Target Vehicle was a spacecraft used by NASA during the early years of the space program, primarily in the 1960s. It served as a target for various missions, including the Gemini program, allowing astronauts to practice docking maneuvers in space. The Agena was equipped with a propulsion system and could be launched into orbit to simulate different space scenarios. Originally developed by the Lockheed Corporation, the Agena was based on the earlier Agena D design. It played a crucial role in several missions, including the Gemini 8 mission, where it was successfully docked with the Gemini spacecraft. The Agena's versatility made it an important tool for testing and developing spaceflight techniques.