Here is the Academic Discipline Mix chart.
http://www.uccs.edu/~armyrotc/docs/ADM List.doc
PoliSci is ADM1 "Generalist", and Business Administration is ADM2, "Technical".
There is a
NEW POLICY from CADET COMMAND. AROTC going forward requires either Brigade or Cadet Command approval (don't know which since the policy enforcement is new), starting with Year Group 2016, for a scholarship Awardee to change from a higher numbered ADM category to a lower numbered ADM category. This new policy was explained to me by a PMS in June of 2011, to be enforced starting in August, 2012 for new MS1 Scholarship Awardees.
My daughter's scholarship last year stipulated Generalist (ADM1), since somehow they thought she was interested in Public Health Administration = Institutional Administration on the ADM list (must have been a typo on the original Application) but she changed to Neuroscience the first week of college (ADM3), without any approval needed since it was an upgrade (two levels of upgrade) in ADM.
What did your son's scholarship award letter specify -- Generalist, or Technical?