Section 183(2) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(2)Before a candidate is selected to undergo the course referred to in Cl. (b) of sub-regulation (1), he must :-(a)be qualified under Regulation 181;(b)have not less than 2 years service as Leading Signalman or Leading Telegraphist or as Leading Signalman and Yeoman of Signals combined, or as Leading Telegraphist and Petty Officer Telegraphist combined;(c)have passed professionally for Yeoman of Signals or Petty Officer Telegraphist;(d)have passed the educational test for Branch.