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USNS Vanguard. USNS Mission San Fernando AO USNS Vanguard TAGM is seen here as NASA Skylab tracking ship Note the SatCom tracking radar and telemetry antennas navsource org United States Navy Public domain PDUSGovMilitaryNavy Original upload log page en USNSVanguard Lordkinbote bytes no TAGM seen here as NASA SkyLab tracking