What's the query?
Just
apply online, declaring your former service.
Your local AFCO will get in touch for you to nip in with your discharge documentation and to sign a consent form for the release of your med docs. Takes about four weeks.
The AFCO will then request Approval to Process your application. This takes another six or eight weeks and the letter will detail the terms under which you may rejoin, the training required, contract and payscale upon which you re-enter, etc. Assuming you left of your own accord, medically fit without disciplinary issues there should not be any significant issues rejoining if you continue to meet the entry eligibility standards.
You'll join on the latest AFPS and your previous pension will remain separate but preserved. You usually dip a pay increment or two, depending on the break in service. (those outside five or more years may well find themselves undergoing an abridged version of phase two training). Contract-wise, you'll have your former service deducted from the length of the new contract.
AFCO wise you'll undergo a selection interview, medical, PJFT and SC before an entry date can be requested (usually a month or two later). There are no significant shortages of ET(WE)'s at present, and as such I'm not aware of any financial incenties for those aspiring to rejoin. One thing I would caution is all the reasons and faults with the job making you chose to leave last time, probably remain unchanged.
When you get an entry date, you'll join Raleigh on the first Wednesday of the month, wearing a suit, shirt & tie. You will take the RNFT, RNST, re-issued your kit, respirator checks, harry weekenders, refresher training, top of sea roster, assignment order to a ship, PJTs, ISSC, back to sea.
Questions?