Just a random thought to throw in:
You might want to alter the Profession Skill to allow it to reflect rising through the military ranks. Money is really a non-issue in SG-1 -- nobody has to buy their own P90 or Staff Weapon -- and making someone plug ranks into the skill will reflect the time it takes to wheel and deal and pass tests and certifications and such while trying to get bumped up from one level to the next.
The big downside to this, of course, is that if everyone in your group gets bumped up, they'd likely be given their own commands, and then how do you adventure together? You could solve this with some sort of "Special Ops" team, composed of high-ranking people (like SG-1, which is kind of putting all its eggs in one basket in terms of having all the most valuable people on one team).
-Tacky