Launched 14:22 local time. Reached 142.7 km. Carried pressure, temperature (Signal Corps Engineering Lab, University of Michigan) experiments for General Electric. The warhead section was replaced with an instrumented full-scale replica of the cylindrical GE A-4 ramjet duct planned for the Hermes B ramjet missile.

At a mechanical systems meeting at MSC, customer and contractor achieved a preliminary configuration freeze for the LEM. Several features of the design of the two stages were agreed upon:

Descent

four cylindrical propellant tanks (two oxidizer and two fuel); four- legged deployable landing gear

Ascent

a cylindrical crew cabin (about 234 centimeters (92 inches) in diameter) and a cylindrical tunnel (pressurized) for equipment stowage; an external equipment bay.

The Defense Department announced the selection of Thiokol Chemical Corporation, Aerojet-General Corporation, and Lockheed Propulsion Company to conduct work on the development of large solid-propellant motors as part of the Space Systems Division's Large Solid Rocket Motor Program (Program 623A). Development work was divided into four tasks: (1) Thiokol and Aerojet-General were to develop 260-inch diameter, solid rocket motors of 3 million pounds of thrust for demonstration static firings; (2) Thiokol was to work on a 156-inch, 3 million-pound thrust, two-segment solid rocket motor; (3) Thiokol was to develop and static fire a 156-inch, one-segment solid rocket motor of one million pounds thrust demonstrating thrust vector control (TVC) through movable nozzles; and (4) Lockheed was to static fire a 156-inch, single segment solid rocket motor of one million pounds thrust that demonstrated TVC through jet tabs.

Grumman conducted manned drop tests to determine the LEM crew's ability to land the spacecraft from a standing position. All tests were run with the subject in an unpressurized suit in a "hands off" standing position with no restraint system or arm rests.

Despite opposition, Kamanin goes ahead with his plans. The 10-day duration artificial gravity flight is planned for October 1965, with Volynov and Katys as the crew. In the first half of 1966 Beregovoi and Demin will fly the long-duration mission, and Ponomaryova and Solovyova will fly an all-female spacewalk mission. However the Americans have announced they will fly a Gemini mission for a 7 to 8 day duration by the end of the year; the Soviets may have to adjust this plan to ensure that they retain the lead in manned spaceflight. Kamanin has told the female cosmonauts of their planned flight, but also warned them there is serious opposition in some quarters.

About four hours before reentry on April 17, the service module was jettisoned and the crew took photographs and made visual observations of the damaged area. About one hour before splashdown the command module was powered up and the lunar module was jettisoned. Parachutes were deployed as planned, and the Odyssey landed in the mid-Pacific 6.4 kilometers from the recovery ship U.S.S. Iwo Jima at 1:07 p.m. EST (18:07 GMT). The astronauts were picked up by helicopter and transported to the recovery ship less than an hour after splashdown.

About four hours before reentry, the service module was jettisoned and the crew took photographs and made visual observations of the damaged area. About one hour before splashdown the command module was powered up and the lunar module was jettisoned. Parachutes were deployed as planned, and the Odyssey landed in the mid-Pacific 6.4 kilometers from the recovery ship U.S.S. Iwo Jima at 18:07 GMT April 17. The astronauts were picked up by helicopter and transported to the recovery ship less than an hour after splashdown.

The day dawns warm at Baikonur (7 deg C at 7 am). The cosmonauts' morning is spent in a review of the space station's guidance and control systems. In the afternoon there is a briefing by officers of IAKM-VVS on use of the vacuum facility 'Polinom' during the flight. The cosmonauts are against use of the device.

Deputy Secretary of Defense William P. Clements designated the Air Force as the Executive service for the Defense Navigation Satellite Development Program (DNSDP). In turn, the Air Force was authorized to establish a program manager and a joint Army, Navy, Air Force program office to prepare detailed plans for the Defense Navigation Satellite System and to manage the program if approved.

Columbia rolled out to pad 39B on March 23. Payloads:

• Spacelab transfer tunnel
• Spacelab Long Module, with Neurolab experiments for the following life science studies:
  • Chronic Recording of Otolith Nerves in Microgravity
  • Development of the Aortic Baroreflex under Conditions of Microgravity
  • Neural-Thyroid Interaction on Skeletal Isomyosin Expression in OG
  • Spatial Orientation of the Vestibulo-Ocular Reflex and Velocity Storage
  • Autonomic Neuroplasticity in Weightlessness

• Extended Duration Orbiter pallet
• Two Get Away Special beams with canisters G-197, G-467, G-772 (Colorado's COLLIDE experiment, which collided small particles into each other to simulate the formation of planets and rings).

The Neurolab mission was managed by NASA-Johnson at Houston, unlike earlier Spacelab flights which were NASA-Marshall/Huntsville's responsibility. Landed at Kennedy Space Center May 3 1998.

Sesat (Siberia-Europe Satellite) used an MSS-2500-GSO (Gals/Ekspress) satellite bus built by NPO PM of Krasnoyarsk, with an Alcatel Espace France payload of 18 Ku-band transponders. The satellite had 8 Fakel SPD-100 plasma thrusters for stationkeeping. Eutelsat operated their Hot Bird fleet of European television broadcast satellites since the 1980's, but the venture into broadcasting to Siberia represented a new step for them. Stationed at 36 deg E. Positioned in geosynchronous orbit at 39 deg E in 2000. As of 4 September 2001 located at 35.97 deg E drifting at 0.005 deg E per day. As of 2007 Mar 9 located at 35.92E drifting at 0.004E degrees per day.

Multi Application Survivable Tether experiment, built by Tethers Unlimited Inc and Stanford University. MAST consisted of the TED (Tether Deployer) satellite, with a 1 km deployable multi-strand Hoytether; RALPH, a small end mass satellite; and between them, GADGET, an inspector 1U cubesat which could move along the tether. Before deployment the MAST package fit into a 0.3 m x 0.1 m module. Failed to deploy, but radio contact made.