Erm, yes, 18 year olds can join the military -- but as I quite clearly pointed out, Paz was an *OFFICER*... this means that he went through a four year NROTC or Academy program. Thus he is at least 21. I suppose since it were wartime he could have had a field comission of some sort, but again it would have taken him years to earn this.
The reason the Confederation class can launch fighters so very quickly (whereas the Bengal and Midway classes are slower) is because the launch and recovery decks are in the same place -- no time consuming internal shifting of fighters.
As for the AMG question... as cute as Quarto's bit about there only being seven whenever anyone quotes the manual, we should probably go with the manual number whenever it can overlap with the game. The game only simulates 7, fine -- but there are plenty of things on every capital ship that the game *doesn't* simulate, but the novels/manual/etc tell us are there.
The Austin being attacked by Gratha *was* unusual -- which is why the Austin's squadron commander insisted that he be allowed to resign.
Wing Commander Academy takes place in 2654 (aside from the first episode). The show is not about the SF Academy (flying isn't even necessary there), but rather (according to the press release) about the 'Wing Commander Academy', a command school of sorts. Case in point, the Sivar episode *has* to take place on 2654.293.
Tolwyn took over command of the Tiger's Claw from Captain Thorn, accusing Thorn of being a traitor. This is referenced in the WCIII novel... I don't recall seeing 750 characters in either WC1 or WCA, so I think we're safe from the tired old "IF I DID NOT SEE IT, IT'S NOT THERE!" routine.
Blair, Marshall, Bowman, Paz, etc were comissioned seconds lieutenants, according to the WCA press kit.