Killing time after class, so figured I'd sit down and babble on about some of the stuff brought up since I posted the last document-piece.
Security Screenings
I was semi-amused by something re the Advanced Combat Training Program I proposed - maybe it was the clumsy way I wrote it up, but nobody really questioned the program itself (which, to clarify, is meant to produce "all-environments" combat leaders, basically to identify masters at tactics and strategy at an early point in their career and to give them extra training. It is probably only at the San Francisco campus, too). The security screening got pointed questions from Pavonis, so I figured I'd explain my thought process:
In my mind, in the "pre-tests" before the entrance exam, everybody applying to SFA goes through a security screening by Starfleet Intelligence - this is a basic sort of thing, similar to the Confidential security clearance level in US parlance IRL, and requires the same things (biometrics checks, agency checks (Federation-wide and local agencies), and credit checks) as the NACLC requires IRL. It's required for entry into Starfleet, whether as officer or enlisted, though for officers the check probably goes farther back in time.
On the other hand, some classes (Advanced Starship Tactics comes to mind fastest) would require the equivalent of a Secret clearance - not so much because it's intended you'll be exposed to classified information in the course or while doing research or whatnot, but because you might be unintentionally exposed. Same checks as the pre-entry checks, but they're done all over again instead of working off the info from one's application period. Might include interviews with associates, though, as well, depending on how paranoid Starfleet Intelligence feels.
The ACTP (which, as I mentioned, probably only exists at San Francisco) probably requires the equivalent of a Top Secret clearance - with just as deep a security screening required. Interviews are mandatory, and the look-back period is something like 10 years IRL. Chances are, by the 24th century, they take a DNA sample as well.
Age range
T'Girl mentions how Starfleet might not restrict itself to younger ages - on the contrary, I think that the older you are, the less likely you are to be accepted to Starfleet Academy, or at least the 4-year program. Direct commissioning or an OCS program is far more likely. Why? Because with the 4 year program (this is especially true for those assigned to San Francisco), Starfleet isn't just looking for officers, it's looking for leaders among officers. Not just future Ensigns, but future Captains and Admirals, who are just-about-always in their first career. 99% of cadets won't turn out to be that! But when Starfleet can identify them early, it helps.
Why restrict it to the young then? Physical vigor is one thing, but mental...Malleability is another. The younger you are, the more likely they can shape your thoughts, attitudes, and habits to those Starfleet requires. (The old maxim attributed apocryphally to the Jesuits comes to mind, which I perhaps am quoting inaccurately: "Give me a boy for seven years and I shall give you whatever sort of man you may desire.") Because at the end of the day, a good bit of the Academy experience is designed to indoctrinate those undergoing it - whether with habits of action, habits of thought, or values - according to Starfleet's requirements. Indoctrination works a lot better on the young than the old.