A SpaceX Falcon 9 rocket launched the NROL-57 mission on behalf of the National Reconnaissance Office. The flight launched a batch of satellites on behalf of the NRO’s proliferated architecture satellite constellation, which are believed to consist of Starshield satellites, the government variant of Starlink. This was the 8th launch supporting the NRO’s proliferated architecture. About seven-and-a-half minutes after liftoff, the first stage booster, tail number B1088, landed at Landing Zone 4. Delayed from March 19/20.