MasterOfPastures
Banned
You're going to have to explain what you're talking about here.
They "Can" use it, obviously, since they do. It's lazy because it's repeating the same broadly illogical decisions made by SF authors stretching back decades rather than striking out and doing something interesting. Why is something outside of water a navy? Why would the word "marine" ever be used to describe exclusively outer-space based soldiers? You could come up with some strained excuse for this, like the US Navy literally started building spacecraft and the US Marine Corps literally started deploying troops to space and somehow got a monopoly on all of this at the expense of all other branches of the armed forces. They don't have something like this, they're just called a Navy and Alliance Marines because uhh dude everyone calls them space marines, it's like a fact.
Also, you've obviously heard torpedos, since you've heard of Star Trek, Star Wars, and Mass Effect. Photon Torpedos, Proton Torpedos, Disruptor Torpedos / Javelin Torpedo System. Any good reason to call them torpedos? Because space is an ocean baby! Embrace the frigates, space admirals, space navies, space marines, skippers, and people shouting "aye aye". Yarr me hearties, thar be star whales to hunt!
At this point I'm shouting at the tide to go back. This "tradition" will be continued mindlessly for an eternity by people who don't care, or worse, like the idea of using all these terms. These people are possibly worse than Hitler.
In time, I think we will see the emergence of it's unique nomenclature and ranking. I mean, the Air Force started out as the Army Air Forces. Once enough work and vehicles are made, a new fifth branch will be made. Starforce, Sunfleet, Starfleet, Vacuum Troops, etc. Calling it navy will be confusing, unless the whole branch is gobbled up and rebranded to.... NotSpace Navy.