Sup Devil Dog,
Good to hear from you again. Someone like you can get into pretty much any program you want if you play your cards right. You are a member of the vest fraternity on earth! Your personal statement will make most med students' PS sound like crap no matter how you tell your story. The EM community is deeply infiltrated with ex military guys who love your type, and wannabe's who are actually neverwere's and live vocariously through you. That said, find the residency you are interested in and don't worry about the AOA/ACGME issue. You CAN get it. If nothing else, by the time you are applying I should hopefully by the grace of God be an incoming chief or senior resident. I'll still be here on the forum you can bet and I'll be happy to pass along any and all connections I have made along this path. I know several of my interviews were soley from being a corpsman. Yes, I took the USMLE and did well, but I think you could still do well in the match without it. A friend of mine just this week matched allopathic ortho as a DO, and he was average across the board believe it or not. Embrace your past, kick butt on 3rd year clerkships and study hard and take Step II early. If you do well on both COMLEX.....greater than 600 each, you have a great shot.
I'll have to disagree with you on the AOA/ACGME quality issue. I think your chance to learn EM is a short one, only 3-4 years. I believe most DO programs reflect too well the type of ED you will be practicing in in real life, but don't always have all the essential tools. I think its really important to have active roles in EMS, flight, trauma, and most importantly some of the things outside the ED that have everything to do with the quality of the institution as a whole. Hec thats why I chose Mayo as my 2nd choice, and nearly ranked it first. Half your EM residency is spent on services outside the ED (nearly). Nothing like training on teams with world class physicians and surgeons, and to me I was not all that confident that there were really ANY osteopathic institutions that included these things without having to ship you to 15 different places to try and fragment/coordinate your education.
And personally, I just hate training in places that have a majority of DO's as attendings. DO attendings are often bitter old men that tow the AOA line at all costs and carry grudges against the modern medical establishment. Before our osteopathic hospital here closed our rotations and residencies there were unbelievably painful and rather bad. Just don't sell yourself short. You have an advantage that few people will ever have...a DD214! Go for it!