That's right, I remember the debate over the size of the station. Okay, so the Marines average at 60% of Naval strength so does that figure include the Marine contingent or are those starfleet regs? Additionally does that account for ships permanently based out of SB118 space docks? Technically the personnel on those vessels would not be quartered aboard the station... And you are saying there are 60,000 civilians... BTW, has anyone considered the fact that there are what maybe 20 or so canonical references to Starbases, not including spacedock... and with 1/5 of the total contingent of Starfleet and Marines combined being officers, has anyone considered the infeasibility to graduate that many cadets from Starfleet Academy to sustain those kinds of numbers? Consider this as well, given the concerns about the Marine Contingent being too big, given the statistical ratio of 1 to .6 Starfleet to Marines this means that there are 75,000 Regs and 45,000 Marines represented. Consider that we have lets just say 100 Marines to a company to include Officers and NCO's, etc., and each Battalion is made up of at least 5 companies, that's roughly 525 Marines per battalion when you factor in S-departmental staff. Lets say you have 7 battalions to a regiment that still only accounts for roughly
How many million people are supposed to be living aboard?
Less than a quarter. The permanent population of the station is around 180,000 - of which Starfleet makes up 120,000 (with 20,000 of those officers and 100,000 enlisted personnel) and civilians the rest. The station can, at maximum capacity, hold a population of 440,000, though I doubt they often get visitor numbers in quite that size.
3,700 troops. Now if you were to scale down the number of Marines to Starfleet from .6 of the Regs to .06 then you have a regimental complement for the Station of roughly 6,800 personnel. Now at roughly 1,500 Marines per Mastiff class and 1,000 per Akira Class Frigate, assuming that the regiment has two of each, plus the afloat battalion split up amongst Discovery, challenger, Ronin and at least two other Ships and you have a regimental garrison size of roughly 1,800 Marines which would be roughly 3 battalions. Even with this math, the numbers are closer to a division, however being Star trek we can ignore that if we want.