Yes. An Army Colonel came to my school a while back to talk about GME and answer various questions we had about HPSP and Army Medicine. One thing she said was that OBC is not necessarily a hard requirement, that people can opt not to go, and use some sort of constructive credit (gained by being active duty during residency/payback) to count toward whatever points you get in your file for having attended OBC. Because of that statement, one of my classmates who was going to attend OBC with us this summer decided not to go.
OBC "optional"??
Oh the funny things they tell you before you become property of the US Army. Here is my understanding, you may be in some sort of circumstance where you cannot attend OBC: academic, time conflict, etc. and that is not a problem, you just don't go. It DOES NOT affect your ability to do an ADT! That is ridiculous! I know that the HPSP handbook makes a big deal of this, stating that you cannot go on ADTs until you did OBC, but then when you go to Brooke, William Beaumont, Eisenhower, etc. you find that many civilian med students rotate through those hospitals, obviously, they didn't go to OBC!
If you have the time to go, I don't see how you can get out it, maybe I am wrong about this. I personally did not have the chance to go due to circumstances much like the person that started this tread. After completing two years of residency I applied for constructive service credit (CSC). In order to do so, you need to write a letter and have several people sign off on it. The DCCS at my hospital would not sign off, he stated that he felt that everybody needed to go to OBC. When this colonel came to your school to talk about it, did she mention this process? Obviously I was angry but somehow someway I sent in the papers and received CSC so I was happy about this. I fear to think that would have happened otherwise. I do know one person that did not get any CSC and he had to complete the regular 11 week OBC and delayed his PCS. Don't let that happen to you, the medical corp OBC is a picnic in comparison, why risk it?
My advice, if you can go, then go, save yourself the pain of applying for CSC, arguing with people, taking the chance of going to regular OBC, etc. etc. Just go. If you cannot go, apply for CSC while in residency and hope for the best.