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SECS (Special Experimental Communications System) was a digital store and forward communications spacecraft for a classified US Navy mission. The design was similar to GLOMR with more data storage, greater redundancy, more space qualified hardware content. SECS was the first spacecraft launched on the air-launched Pegasus launch vehicle. It was built by Defense Systems Inc (DSI), was spherically shaped and approximately 0.6 m in diameter. It operated for 3.5 years.

Alternate Names

  • 20547
  • Special Exp Comm System
  • USA 55

Facts in Brief

Launch Date: 1990-04-05
Launch Vehicle: Pegasus
Launch Site: Edwards Air Force Base, United States
Mass: 25 kg

Funding Agency

  • Department of Defense-Department of the Navy (United States)


  • Communications
  • Surveillance and Other Military
  • Engineering

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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