2401 adp officer, pcm 6101 accounting officer 73d accounting specialist 225b ada command and control maintenance technician 2110 adjutant or adjutant general 2120. list of vietnam war era usmc military occupational specialty codes (mos codes), verified from information included in the defense casualty analysis extract file (dcas),. military intelligence specialist set oper. 97c area intelligence specialist. 97d military intelligence coordinator. 42e optical laboratory specialist. 3179 oral medicine officer. 964a order of battle technician. army mos codes, vietnam war era. The following is a list of us army military occupational specialities…