if you're going to borrow from WH40k, at least mention boarding torpedoes!
Marines started out as naval fighters intended for boarding actions (and repelling them), and amphibious assaults on coastal targets. Their modern-day iterations are usually tasked with missions of assaulting target areas, while deploying from naval vessels, but they do still provide security services for naval vessels.
If the future has space-faring vessels, they will be protected by space-marines (not necessarily in the style of WH40K, probably more like the ones from Aliens or Halo), and ship-boarding actions would not be out of the question, sometimes capturing an enemy vessel intact can be advantageous for a space fleet. They can also neutralize a vessel's various crew, which could cause all sorts of havoc, like disabling engines/navigation, weapons (gunnery, loading, etc), power generation and distribution, communications, and helms.
Don't know if the dev is wanting to go that route with the game or not, but it could add a new dynamic to the game if desired in the future.
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