San Marco 1 was an Italian flight test of the satellite to furnish data on air density and ionosphere characteristics. The Scout-X4 launch vehicle was provided by NASA and was launched with an Italian launch crew from Wallops Island. December 15, 1964 at 20:20 UTC · Launch Successful Scout X-4 — National Research Council, to Low Earth Orbit Launch Area 3A, Wallops Flight Facility, Virginia, USA The world's 390th orbital launch attempt, and 97th of 1964. Data: Launch Library 2, The Space Devs. Image by U.S. Air Force (Department of Defense Image Use Policy) via The Space Devs.