
The Timation satellites were conceived, developed, and launched by the Naval Research Laboratory in Washington, D.C. beginning in 1964. The concept of Timation was to broadcast an accurate time reference for use as a ranging signal to receivers on the ground. On 31 May 1967 the Timation-1 satellite was launched. This was followed by the Timation-2...
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http://en.wikipedia.org/wiki/Timation

American military navigation satellites, launched as part of the NAVSTAR-GPS program. Both had a mass of about 700 kg and were launched from Vandenberg Air Force Base. Spacecraft Launch date Launch vehicle Orbit Timation 1 May 31, 1967 Thor-Agena D 894 × 900 km × 70.0° Timatio...
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http://www.daviddarling.info/encyclopedia/T/Timation.html
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