Mercury Spacecraft on launching pad July 19, 1961; back of photograph labeled, "U.S. Air Force Photo for the National Aeronautics and Space Administration... Air Force Missile Test Center Photographic Laboratory Operated by RCA, LOD61-6390 7/19/61, CCMTA/NASA/Mercury, Prelaunch Activities on MR-4., Pad 5. unclassified.", RCA inspected. Color: BK,WH