Section 272(13)(b) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(b)The undermentioned categories of ex-sailors shall not be re-entered:(i)Those discharged unsuitable.(ii)Those discharged as "Service No Longer Required", provided that those discharged "Service No Longer Required" under Regulation 268 consequent on reduction of authorised establishment may be re-entered in accordance with the above provisions.(iii)Those dismissed from the Naval Service.