Fate-
The 15 +- weeks is after you check-in to flight managment and go through medical. You have to get an up chit from NOMI here in Pcola. After that you have to take an in PFA and swim test. Then you sit in the A-pool. While in the A-pool you get to take BOLTC (Basic Officer Leadership Training Continuim) and IFS if you have not already had that. BOLTC and IFS do not affect the waiting period. Then on some thrusday you will be told that you are classing up for API. For most newly arrived students the wait is around 15 weeks for Whiting, a little quicker for CC, probably much quicker for Vance or Moody.
dhafeman-
You will do one of three things regardless of where you got your comission. Stash job, muster or a clss of some kind (BOLTC or IFS). If you don't have a stash job and you are not in IFS or BOLTC, you muster 5 days a week. MWF are PT and Tuesday is a uniform inspection muster. Haven't been inspected yet, they just pass out info at the muster location. Thurday everyone musters in the auditorium to see who is classing up.
Hope that helps. I am stuck in the A-pool as it is so if you have any other questions feel free to ask.
I know you want to get started as soon as possible, but I have been on the other end with two deployments. You want as much time off as possible before you hit the books very hard.