continue upper atmospheric research was expanded to include development of the Vanguard rockets. The Viking was thus incorporated as the first stage of NRL's three-stage Project Vanguard vehicle which launched the second U.S. satellite in 1958. Vikings 13 and 14, substantially similar to Vikings 8 through 12, were used as suborbital test vehicles (Vanguard TV-0 and Vanguard TV-1) before the first Vanguard vehicle, Vanguard TV-2, became available for test in the fall of 1957. Current examples The National Air and Space Museum contains a full-size cutaway reconstruction of Viking 12, built from original blueprints and reconstructed from parts recovered from the original rocket. The vehicle was donated by the Martin Marietta Corp in 1976 to the Smithsonian. Table of flights (Vikings 1–12, excepting Viking 4, were flown from White Sands Missile Range, New Mexico.) Vikings 13 and 14 were launched from Cape Canaveral. See also Vanguard rocket References Spaceflight before 1951 1951 in spaceflight 1952 in spaceflight 1954 in spaceflight 1955 in spaceflight Sounding rockets of the United States