I heard that it's 30xxxxxx because it's a tri-service number. However, recently when sifting through the mail I noticed a 2nd LT with the number 2521xxxx. Then I was told that officers numbers are now the same as anyone elses. However, I've been led to believe people who join up now are 30xxxxxx???
I was told I would keep the old number, but not the case. The -2 at the end of the numbers I am told is for those that were serving over the JPA change over, and the -2 part is for when deployed on ops, so pay office can cope with not being on TA MTD's so that your parent unit UIN does not get billed for 8 months worth of MTD's.