do the majority of D.O. physicians complete the USMLE examinations in addition to the COMPLEX prior to beginning residency - as I understand USMLE is not a requirement prior to joining residency for D.O. physicians, I just think thats an awful lot of tests before residency, 4 as I can imagine, 5 including the CS examination. Can someone please inform me of this? Say both competitive and not so competitive specialties, do most D.O. physicians complete the USMLE steps as well prior to residency? thanks.