Section 243 in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
243. "Additional" not for Special Service.
- Captains and other officers of the Executive Branch who are borne on the books of any of Indian Naval Ships as "Additional", but not for any special or particular service, shall take rank and command in the ships in which they are so borne, and be considered as if they belonged to the complements of such ships.
