Okay this may come to a shock for most of you but a great deal of manual medicine taught in your OMM courses are not sole property of the DO's
My very first clinical rotation was in IM by and MD, he used trigger point therapy and swore by it and he gave me tips on how to succesfully treat trigger points better than any DO I ever met (okay throw your tomatoes now). Newsflash, physical therapist, massage therapist all use trigger points, this was not some DO invention.
All those little test you learn in OMM Apleys's test, Yergasons, Psoas sign, McMurrays, Straight leg raising, etc., guess what, these are all diagnostic manual musculoskeletal techniques that MD's do too. Its amazing! When you are in DO OMM lab, the profs act like these things are "our little secret", you get out on rotations and find out that these things, e.g. the reduction of a dislocated shoulder mentioned above, have been standard in medicine for many years and are not property of the DO's
What is ours? Cranial, HVLA, muscle energy, and counterstrain. And even though I know nothing about chiropractic medicine or natural medicine, I am sure experts in those fields can argue they do the same things with different names and slightly different theories on how the techniques work.