Section 278(1)(a) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(a)If the sailor volunteers for some other [rank] [Substitued by S.R.O. 192, dated 10th September, 1973] the duties of which he is considered competent to perform, application for transfer is to be made in accordance with Regulation 273. When sailors, who are serving in a different branch from that in which they were entered, are found unsuitable for the duties of the lowest [rank] [Substitued by S.R.O. 192, dated 10th September, 1973] to which they can be reverted in their present branch, application may be made for compulsory reversion to their original branch.