Delta IV heavies also launched from Vandenburg since long before f9 existed, and is considerably louder than falcon 9. was there a need for that study?

The study was apparently for the Delta IV. https://x.com/mcrs987/status/1848070131781455911

same thread, tory bruno says it was not for delta IV

https://x.com/torybruno/status/1848797537215410627

I'm pretty sure he's talking about Starship, not Falcon 9. Starship doesn't launch from Vandenberg; neither Starship launch site has seals present.

Propellant mass 441,800 lbs (https://en.wikipedia.org/wiki/Delta_IV_Heavy) to 906,000 lbs (https://en.wikipedia.org/wiki/Falcon_Heavy) in the respective first stages.

falcon 9 heavy has never launched from vandenburg.

But it will.

https://www.vandenberg.spaceforce.mil/News/Article-Display/A...

(Starship hasn’t, either.)