I fought this fight for two years, and eventually won...but learned a lot. Technically, your command is not supposed to seek an SRB for you if you have submitted an application to become an officer (STA21, OCS, LDO, etc.) However, the date that the SRB Desk uses for submission and the date that STA-21 uses are different. By the STA-21 rules, you submitted a package when you gave it to your CoC (probably somtime around May/June for most of you). The SRB guys claim that your package is not submitted until your CO signs it/mails it (which shoud be 1 July for most of you).
I reenlisted in June, and STA-21 took my SRB initial installment and my October installment. I fought until Feb 2010, and eventually got them to see things from the SRB Desk point of view and got my money back. I don't think you are going to have a chance in hell of getting an SRB if you reenlist after 1 July, and if you do, don't spend it because STA-21 will take it right back (one guy in my BOOST class had to give back $25,000).
Lesson Learned: you better reenlist BEFORE the date your CO signs your package.