Was99125, a member of our message forum, provides the following information about the 9S100 job:
The reason that 9S100 is a Reporting Identifier and not an AFSC is that the field is so diverse and amorphous that it is virtually impossible to nail down the exact nature of the work that you do/will be doing. I have known airmen who do a job that is so unique that they were the only ones in the AF who did it.
I can honestly say that I never knew a 9Sl00 who didn't like the work and wasn't "chomping at the bit" to go to work. The job is so varied that you will learn something new everyday. There is something to be said about working with intelligent people that keeps your interest. Most (if not all) 9s have degrees or college experiance. I worked with/for TSGTs and MSGTs that had Masters degrees.
jrguyette, another member of our message forum with 9S100 experience, relates the following:
I'm another ex-9S -- I've been out of the career field for all of about 8 months now. When I left I was in one of those the-only-one-in-existence jobs. It rocked. Yes I was at Patrick, and yes I mostly worked Monday through Friday, 7 to 3, but the project before that I had all kinds of crazy shift schedules of 12-hr shifts, 24/7 ops. It really all depends. I can think off-hand of 20 radically different jobs 9S's do -- again, we're not an AFSC like "F-16 avionics mx" where it's pretty obvious what you do.
I don't know what you'd call exciting -- It depends on what floats your boat, really. If you're really into computers, there's a 9S job for you. Ditto if your thing is McGyvering geek-toys that may or may not work or ever get used by people, using and experimenting with other people's geek-toys until they break, turning wrenches on machines (either in a depot or a mountain range), visiting places not fit for human life, controlling satellites, sitting on staff to explain obscure science to non-scientifically-oriented folks (and having access to real scientists to expand your understanding), flying around in back of a plane, giving lots of briefings to lots of brass, running an ops center in DC, travelling a lot, or holding down a chair in front of a computer screen for 8-12 hours while you get paid to do lots and lots of homework. There are also a few opportunities for more mundane stuff like paperwork and teaching at the schoolhouse and doing part-time honor guard and documenting people's training if that's your thing, for some strange reason. And that still doesn't cover it all.
See why, for brevity's sake, we usually just say "very wide variety"?? =)
When you first get out of school you'll be assigned a job, and there will be plenty of people to show you the ropes of that job, and you'll have two big books to study that will give you the big picture, so don't worry about finding out about everything. After you do your first job for a few years, you can write your own ticket to a good extent -- you always know what jobs are coming available, and you just let the right people know that you really really want one of them (Everybody knows everybody -- literally). If you're an awesome troop and more or less meet the rank requirements, it's that easy most of the time.
Take it from us -- you got a sweet job. Be excited about it. Stick with it, and it can be pretty much whatever you want it to be. You'll find out all the specifics maybe halfway through tech school.
I forget how many credits you get from tech school. It varies depending on which follow-on class you take (which specialty you start in, basically) but I think mine got me something unreal like 57. They're in specific course-equivalents though, and some will possibly duplicate work you've already done, and many will likely not apply toward whatever program you decide to major in.
If you really want to finish your bachelor's in your first few years -- ask for seismic analysis, satops, or systems control. Coincidentally, all of these shops are always happy to take new airmen.

