Didn't some UC school allow their DO grads to turn into MDs after paying a fee? Yeah. BIG difference in philosophies, clearly.
It was a big deal here in California (I go to COMP if the signature isn't showing up). This is what I remember from lecture, so, confirm any info you see here with a reputable source.
The UC school was Irvine. Also, it wasn't just UC Irvine - it was ALL California DOs. They took a test that was basically a formality, paid some money ($25?), and got an MD slapped on to their name.
Some interesting facts of note (if I remember correctly from lecture):
1) It was supported by a lot of the DOs at the time.
2) It turned out really, really badly. The MD world wasn't too keen on taking DO converts. Also, those converts couldn't really go anywhere else since other states didn't recognize them as MDs or DOs.
Eventually it got overturned (obviously).
I see it as a learning experience.
The only reason I can possibly see for changing the letters from DO to ANYTHING else (MDO, DOM, blahblahblah) is to gain more acceptance abroad since DOs in Canada and elsewhere aren't fully licensed physicians. As far as I know, DOs in Canada are generally referred to as "Osteopaths" who essentially are equivalent to chiropractors in the US.