The BE (Beacon Explorer) satellites provided Laser reflectors for geodetic measurements as well measured the electron density in the ionosphere. October 10, 1964 at 03:01 UTC · Launch Successful Scout X-4 — National Aeronautics and Space Administration, to Low Earth Orbit Space Launch Complex 5, Vandenberg SFB, CA, USA The world's 368th orbital launch attempt, and 75th 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.