Embassy
You will have to complete an inperson interview with the gaining unit, whichever it is.
That is preceded by a research paper, hand written bio, DLAB score, typing test, and a plethora of paper work from your SRB.
My point is that you may be better served to associate with a local unit and use them to bring your annual stuff up to date.
It is possible to join direct but you will have to be completely proactive in making contact with the CIs of the joining unit in order to be screened. A Prior Service Recruiter can not submit to fill an 0211 BIC without the screening letter.
I have completed this process and it is 99.99% on you. You will only need the PSR for the last .01 percent of the process.
Frank
www.killfoot.com