AR 40-1 governs the composition, mission, functions, and responsibilities of the Army Medical Department and its corps.
View AR 40-1 on armypubs.army.mil
AR 40-1 covers AMEDD organization, command positions, corps chiefs, and corps-specific branch proponent officers. It sets requirements for officer utilization, rating schemes, routing, and staffing.
Specifically, these special branches are the MC, DC, VC, MS, AN, and SP. (paragraph 1-6)
An RHC is a regional command element that oversees the day-to-day operations of MEDCENs; MEDDACs; Army health clinics, DHCs; PHRCs; PHAs, and numerous clinics throughout the United States, Europe, and Asia. (paragraph 1-6)
Serves as principal advisor to the TSG on all matters concerning their corps. (paragraph 3-9)
The corps chief will select the CSBPOs, who will be of the following rank or grade: for each of the officer corps, a colonel; for the EC, a sergeant major; and for the CC, a senior civilian in grade GS15 or equivalent. (paragraph 4-3)