AF flight 27. Powered pilot-check flight. References: 49 , 97 .

NACA flight 16. Stability and loads investigation. Mach 0.89. References: 49 , 97 .

Ustinov's requirement was to deliver a 3000 kg nuclear warhead over a 3000 km range (eg to reach the United Kingdom).

Gas composition research. Launched at 1412 local time. Reached 143 km.

Micrometeorites research. Launched at 0819 local time. Reached 61 km.

At a press conference in Washington, D.C., NASA Administrator T. Keith Glennan announced the seven pilots had been selected for the Mercury program. References: 16 .

The R-9 exploded on the launch pad adjacent to that from which Yuri Gagarin would be launched three days later, in view of the cosmonauts. References: 98 , 445 .

Missile Defense Alarm System. References: 1 , 2 , 5 , 6 , 171 , 172 , 278 .

This Air Force conducted test program contributed significantly to the development of the Gemini launch vehicle; the Gemini malfunction detection system was tested on five flights, Gemini guidance components on three, and the longitudinal oscillation fix on four. In addition to flight testing these (and other) critical components, these flights also enhanced confidence in the use of the Titan II as a launch vehicle. Thirty-two Titan II test flights were analyzed to determine whether any characteristic of the flight would have demanded a Gemini abort; 22 were adjudged successful from the standpoint of a Gemini mission, nine would have required Gemini to abort, and one resulted in a prelaunch shutdown.

George E. Mueller, Associate Administrator for Manned Space Flight, announced the transfer of control over manned space flights from Cape Kennedy, Fla., to Houston, Texas. MSC's Mission Control Center would direct the flights from end of liftoff through recovery. References: 16 .

Suborbital. References: 5 .

Investigation of the upper atmosphere and outer space. References: 1 , 2 , 5 , 6 , 99 .

Area survey photo reconnaissance satellite. References: 1 , 2 , 6 , 93 .

Geodynamics Experimental Ocean Satellite. The mission of GEOS 3 (Geodynamics Experimental Ocean Satellite) was to provide the stepping stone between the National Geodetic Satellite Program (NGSP) and the Earth and Ocean Physics Application Program. It provided data to refine the geodetic and geophysical results of the NGSP and served as a test for new systems. A major achievment was the flight of a radar altimeter. Further mission objectives: intercomparison of tracking systems, investigation of solid-earth dynamic phenomena through precision laser tracking, refinement of orbit determination techniques, determination of interdatum ties and gravity models, and support of the calibration and position determination of NASA Spaceflight Tracking and Data Network (STDN) S-band tracking stations. References: 1 , 2 , 5 , 6 .

Area survey photo reconnaissance satellite; returned film capsule. References: 1 , 2 , 6 .

Manned two crew. Docked with Salyut 6. Carried crew comprising L I Popov and V V Ryumin to the Salyut-6 station to carry out scientific and technical research and experiments. Returned crew of Soyuz 36 to Earth. Recovered June 3, 1980 15:07 GMT. Landed 140 km SE Dzehezkazgan. References: 1 , 2 , 6 , 32 , 33 , 51 .

Radar calibration mission. References: 1 , 2 , 5 , 6 .

High resolution photo reconnaissance; returned film in two small SpK capsules during the mission and with the main capsule at completion of the mission. References: 1 , 2 , 6 , 179 .

High resolution photo reconnaissance; returned film in two small SpK capsules during the mission and with the main capsule at completion of the mission. References: 1 , 2 , 6 , 179 .

Carried SIR-C SAR radar. Payloads: Space Radar Laboratory (SRL) 1; Consortium for Materials Development in Space Com-plex Autonomous Payload (CONCAP) IV; three getaway special (GAS) payloads; Space Tissue Loss (STL) A, B; Visual Function Tester (VFT) 4; Shuttle Amateur Radio Experiment (SAREX) II. Additional Details: STS-59. References: 1 , 2 , 5 , 6 , 7 .

Unmanned resupply vessel to Mir; carried GFZ-1 German sub-satellite to Mir. Docked with Mir on 11 Apr 1995 21:00:44 GMT. Undocked on 22 May 1995 23:42:37 GMT. Destroyed in reentry on 23 May 1995 03:27:52 GMT. Total free-flight time 2.22 days. Total docked time 41.11 days. References: 2 , 6 , 275 , 276 .

Covered Oko constellation planes 8/9 - 217 degree longitude of ascending node. References: 4 , 100 .

The DSP F19 payload was a USAF Defense Support Program missile early warning satellite equipped with an infrared telescope to detect rocket launches. The Titan 4B placed the IUS upper stages and payload into a 188 km x 718 km x 28.6 deg parking orbit. The first stage of the IUS burned at 18:14 GMT and put the second stage and payload into a geosynchronous transfer orbit. The IUS second stage fired at 23:34 GMT. However, the two stages of the IUS failed to separate completely. At least one connector remained attached. This meant the second stage motor nozzle did not extend properly. When the stage fired, the vehicle tumbled during the burn. The DSP was left out of control in a useless orbit.