Some of these spy satellites point away from Earth. I know on good authority the USSF is interested in propulsion systems for nanosats that will be used for defense between low Earth orbit (LEO) and the moon. They want swarm capability.
Also, just because they say it failed doesn't mean it's not actually used for another unpublished purpose.
Oh, great point there that the "failure" could well be a cover.
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Anything governments or their respective major media outlets say their say about satellites is most likely a deception, the national security interests of every major country see anti-satellite warfare as contested battlespace and the next generation warfighting domain
Semper Supra
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