The short answer is yes, there are indeed additional courses for different specialties and they vary by branch (in fact training and education never stops).
Using myself as an example: When I went to FAOBC (lo, these many years ago), it was combined with what they used to call FA Cannon Battery Officer's Course (FACBOC), which focused on cannon battery operations, maintenance, fire direction and tactics. The FA school combined the courses to give FA LTs better training in the basics of artillery (male and female officers), as having them separated did not work out well for officers who were cross posted from missile systems to cannon batteries.
After FAOBC, I went to an additional school to learn about additional subjects, as did every officer, except those who were going straight to a fire support or cannon battery assignment (if they needed specialty training later on in their careers, they were normally sent back to Fort Sill for it).
In my specialty course, FA Target Acquisition and Survey Officer's Course, I picked up FA survey training and I was also trained in metrological operations, sound/flash ranging (boy, I am really dating myself here, aren't I?) and RADARs. FIREFINDER was brand new back then and I was not really trained on it much - that came later, but I am not qualified to run a Q36 or Q37.
The new model OBC will have all newly minted LTs attend a basic branch immaterial OBC, problably at Fort Benning, and then send them on to their branch specific training, which is kind of what I described above, but mre formalized. Just about all of the brach schools have additional specialty courses for different areas.
In your case, if you are indeed commissioned as a 12 series officer and receive an assignment to a scout or cavalry unit, then you would complete the Scout Leader Course after OBC. Other training would be scheduled depending on the unit you are going to and when they need you there.
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