The requirement of registration is waived for any official of the . Army, Navy, Marine Corps, Air Force, Coast Guard, Public Health Service, or Bureau of Prisons who is authorized to prescribe, dispense, or administer, but not to procure or purchase controlled substances in the course of his/her official duties. Such officials shall follow procedures set forth in Title 21, CFR § 1306 regarding prescriptions, but shall state the branch of service or agency (., ". Army" or "Public Health Service") and the service identification number of the issuing official in lieu of the registration number required on prescription forms. The service identification number for a Public Health Service employee is his/her Social Security identification number.