catamaranpies,
you may have already found the answer to this question. If not:
The Army has the four programs that were mentioned in this thread as well as at UTSA and Duke. Both of these civilian programs can be matched into by an Army fourth year med student (HPSP or USUHS) via the Army matching system/ERAS. Duke is graduating their first Army resident this year, so it is a relatively new program as far as Army involvement goes.
What typically gets done is if you match at Duke through the Army match you will do your intern year at the new Walter Reed in Bethesda. If you match at UTSA, you will do your intern year at BAMC. Both of these intern years are in general surgery. Then its off to Duke or UT to finish up your urology training. Hope this helps. Good luck