What is your source for this info?
My facility senority roster.
OKC start date is the EOD for OTS, VRA, and CTI who went to the academy prior to reporting to the facility. EOD = senority date, for this group of folks.
Once upon a time (as recently as last calendar year), the EOD = the day you walked into the facility. This is no longer the case, and a very good thing - in my opinion.
Edit: Just saw diver's response. S/he is in a different region than I, and thus we may be getting different interpretations of a lot of changes that took place in 2007 regarding folks going to OKC. I will double check, and get back with you. But, as it stands now - at my facility, EOD is the day folks reported to the academy.