https://theaviationist.com/2025/07/31/northrop-grumman-usaf-test-fire-sentinel-stage-two/
Northrop Grumman and USAF Test-Fire Sentinel ICBM’s Stage-Two Rocket Motor
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https://news.northropgrumman.com/sentinel/Northrop-Grumman-Tests-Sentinel-Missile-Stage-Two-Rocket-Motor?utm_source=&utm_medium=&utm_campaign=
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