Damn, this just isn't my week. You're right. I called them up to verify the change. They said the changed occurred in March '06 (about 7 months after I had enrolled) and was due to the Navy, not them. The Navy told them not to accept any more O-3 applicants. Now, you must be at least an O-4 select.ACSC now requires you to be an O-4 select for enrollment.
http://wwwacsc.au.af.mil/distance-learning.asp
She specifically told me you had to be at least an O-4 select for the Navy. I didn't ask about any other services and I made it clear to her that I was only interested in Navy requirements. I'd call em up if I were you and see if you can enroll over the phone.Signing up online w/ them as anything other than AF/AFR/ANG requires DEERS to show you as an O-4 already. Already tried as a select. Sister services apparently require you to already be wearing it acc. to their website. Only blue suits get the select privilege now.