I don't know about other services but I just tried to transfer from NG to active army 11B and they said there not accepting anything except 18x right now. And I always heard it was easy to switch while on title 10 orders but I guess not. Maybe its because its the near the end of the fiscal year
I have an E-3 12C that I'm releasing to switch to the AC. He already has his 368 from the recruiter but I believe he was told that it won't take effect until October. He is USAR though and not NG.