Agena is a type of upper stage rocket that was used by the United States during the Cold War era, primarily for launching satellites and conducting space missions. Developed by the Lockheed Corporation, it was first launched in 1959 and played a significant role in various military and scientific projects, including the Corona satellite program. The Agena rocket was notable for its versatility, as it could be used with different launch vehicles, such as the Atlas and Titan rockets. It was equipped with a powerful engine and could carry payloads into various orbits, making it an essential component of the U.S. space program during its operational years.