Silentbarker is a class of classified United States spy satellites for space domain awareness developed by US Space Force and National Reconnaissance Office.
In December 2025, USSF System Delta 89 announced that it was seeking a new satellite to replace the Silentbarker series. The USSF has also said it intends not to partner with the National Reconnaissance Office (NRO) for the replacement.
Satellites NameLaunch dateLauncherCOSPAR IDStatusNotesSilentbarker 1, USA-346 10 September 2023 Atlas V 2023-140A NROL-107Silentbarker 2, USA-347 10 September 2023 Atlas V 2023-140B NROL-107Silentbarker 3, USA-348 10 September 2023 Atlas V 2023-140C NROL-107
See also Space domain awareness Space Based Space Surveillance Geosynchronous Space Situational Awareness Program
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