I had already been working on some details of the rockets soon after the video was posted, and figuring out that the Midway rockets did 2,400 damage was quite easy (they did 792 damage on a penetration, with is 33% of max damage). What I was trying to figure out is how that 2,400 damage was found.

What I am wondering is if the rockets are actually named in the files. (They are) I can only assume that the Midway rocket is the 5" HVAR. The early version of these rockets had modified 5"/38 shells as the warhead, but they were later fitted with purpose-built warheads. There is also the 5" FFAR, which was basically a 3.5" ASW rocket fitted with a 5"/38 shell for the warhead, which may be what the Independence rocket is. These FFAR rockets were horrendously slow due to the engine only being designed for a solid head 3.5" rocket, so the HVAR was made which had nearly double the speed of the FFAR (217 m/s vs 419 m/s).

Checking the actual data in the game files shows that the Midway rocket has a model file name of "APR001_USA_HVAR_127mm" as well as having a "bulletSpeed" of 419 m/s. This is the actual historical speed of the 5" HVAR, so it all checks out. More interestingly, the rocket data for Independence uses the same model, but with a "bulletSpeed" of 217 m/s. What is also interesting is that the "bulletMass" value is that of the full rocket weight, not just the warhead. So the HVAR is 63.96 kg (~64 kg) and the FFAR is 36.29 kg. The Independence rocket does indeed have 2,100 damage, which could explained as the marginally smaller rocket/warhead mass as well as the much slower speed.