Second flight with pumps, altitude 250 ft; then heeled away from tower. References: 482 .
The Chief of Naval Operations directed the Navy's Bureau of Aeronautics to make preliminary investigations in the field of earth satellite vehicles. References: 483 .
First launching of a cluster of three Deacon rockets as a booster at NACA's Wallops Island. References: 17 .
Solar radiation research. Launched at 0754 local time. Reached 143.3 km.
Martin Company personnel briefed NASA officials in Washington, D.C., on the Titan II weapon system. Albert C. Hall of Martin had contacted NASA's Associate Administrator, Robert C. Seamans, Jr., on April 7 to propose the Titan II as a launch vehicle for a lunar landing program. Although skeptical, Seamans nevertheless arranged for a more formal presentation. Abe Silverstein, NASA Director, Office of Space Flight Programs, was sufficiently impressed by the Martin briefing to ask Director Robert R. Gilruth and Space Task Group to study possible Titan II uses. Silverstein shortly informed Seamans of the possibility of using the Titan II to launch a scaled-up Mercury spacecraft.
After study and discussion by STG and Marshal! Space Flight Center officials, STG concluded that the current 154-inch diameter of the second stage (S-IV) adapter for the Apollo spacecraft would be satisfactory for the Apollo missions on Saturn flights SA-7, SA-8, SA-9, and SA-10. References: 16 .
Alan B. Shepard, Jr., Mercury astronaut, was awarded NASA's Distinguished Service Medal by President Kennedy in a special White House ceremony. It was followed by an informal parade to the Capitol by the seven astronauts for lunch, and a press conference at the State Department auditorium. References: 18 .
Transport of various cargoes to the Salyut-7 orbital station. Docked with Salyut 7 on 10 May 1984 00:10:00 GMT. Undocked on 26 May 1984 09:41:00 GMT. Destroyed in reentry on 26 May 1984 15:00:30 GMT. Total free-flight time 2.28 days. Total docked time 16.40 days. References: 1 , 2 , 6 , 275 .
Final launch of the Scout booster from Vandenberg AFB (first launch on 26 April 1962). References: 88 .
Early warning satellite for the US Air Force. Delivered by the two-stage IUS-22 solid rocket into geostationary orbit. Fullfilled mission of DSP 19 launched in 1999 into the wrong orbit when its IUS stage failed.