The BE (Beacon Explorer) satellites provided Laser reflectors for geodetic measurements as well measured the electron density in the ionosphere. April 29, 1965 at 14:17 UTC · Launch Successful Scout X-4 — National Aeronautics and Space Administration, to Low Earth Orbit Launch Area 3A, Wallops Flight Facility, Virginia, USA The world's 430th orbital launch attempt, and 37th of 1965. Data: Launch Library 2, The Space Devs. Image by U.S. Air Force (Department of Defense Image Use Policy) via The Space Devs.