Artemis IX/SLS Block 2 booster update: “On June 26 at 1pm ET, we are static test firing the Booster Obsolescence and Life Extension solid rocket motor – the largest segmented solid rocket booster ever built.”
https://x.com/NGCNews/status/1935775033974227070
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These are replacing the old Shuttle-derived SRBs for SLS Block 2. [Here’s some test footage of the older models](https://youtu.be/J5NHJEUk310?t=4m35s) to give you an idea of how *loud* these static fires get.