How big is Spacefleet?

I've been wrestling with this for a while: there don't seem to be enough people in the UPF Spacefleet or in the Naval forces of the Frontier in General.  I listed all the ships in SW2 per Knight Hawks (remastered) and the total number of personnel on mobile units, including fighters, is about 4,500.  Even if you factor in Fortresses and Armed Stations and construction yards, support staff behind the scenes, the entire mobilized forces protecting the frontier come out to the equivalent today of the Canadian Armed Forces.  That strikes me as a little thin for the Frontier.<div><br /></div><div>It's even worse if you tally up the militias: they come to a total of 500 people in mobile units.  Just the Clarion Royal Marines have under 100 people on mobile units...and that doesn't feel right.</div><div><br /></div><div>Has anyone else done the numbers here?  I can se landfleet numbering in the millions and therefore needing a lot of troop transport personnel, but Spacefleet just feels to small!</div><div><br /></div><div>How big is Spacefleet?</div><div><br /></div><div>How big should it be?</div>