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Globalfromal as I'm sure you know, try to be as proactive as possible. Get your medical and dental knocked out as soon as possible if you haven't already, and also start working on the items on your checkout sheet for changing commands that would not be premature. This will make sure you don't get hung up on anything once you do have a FS letter and a solid OCS date. The last step @
KNSnowy listed will likely apply to you in some way, unless you have an active TS/SCI, but even then they might do a community consult interview. Make sure you are spun up on all the things you may encounter in the interview (current events, ONI director being investigated, ONIs various AOs and mission focus, etc.). A couple of my buddies really got spun in a counterintelligence board when they couldn't sincerely differentiate between Sunni and Shia. While you might, it serves as an example of the type of things you may be presented with.
I know when I was applying for a special duty billet in the Marines it felt like nearly everyone was working against me because my command didn't want to lose me, fortunately the Navy doesn't seem to be as counterproductive in that way. Just be forward and ask anyone and everyone that would know what your next step is to expedite the process. Granted I got out to attend college and am applying for a different branch, but in similar situations I saw administrative obstacles being the largest delaying factor. I know this is quite generalized, but good luck and congrats.