When you show up at OTS, the selection process is complete. The only way out is to quit or flunk. In either case, you will become Mr. Billy 738, no longer 2Lt Billy 738. Can't say about a MEPS physical, but if you have a "cleared" Class I, it is probably for anything.

One other point, for the recruiter, meeting enlistment quotas is everything, rated officers are frosting on the cake and something they won't get huge credit for doing. So, they might be teensy bit stressed. Be prepared every time you visit or go to an interview--required documents checked, be polite, dress like its a job fair, listen much, ask questions. Think thru answers to demonstrate interest in the unit and mission.

GF