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Do any other launch service providers, like United Launch Alliance, make these specifications publicly available (without needing to sign an NDA or whatever)?

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Yes.

Here's Delta IV: https://www.ulalaunch.com/docs/default-source/rockets/delta-...

This looks like what I was expecting to see.

The Users Guide from SpaceX looks more like a brochure.

Indeed. I expect a user guide to have exact instructions on how to use a device. SpaceX's brochure doesn't even go far enough to call it a specification sheet.

To be fair, Delta IV had been flying for decades

And the one for Soyuz from Arianespace

https://www.arianespace.com/wp-content/uploads/2015/09/Soyuz...

Yes, and usually with much more detail (and in SpaceX's defense, the Falcon 9 user guide is also much more useful than this). This is super light on technical info in comparison (really the only specs are fairing size, very little about orbits)

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