Section 21(6)(b) in The National Cadet Corps Rules, 1948
(b)in the Junior Division if he has rendered service as an officer not below the rank of Junior Commissioned Officer of a Viceroy's Commissioned Officer in the Army or a Chief Petty Officer in the Navy or a Warrant Officer in the Air Force or a Commissioned Officer in the National Cadet Corps or has passed Certificate `B' or `C' Examination of the National Cadet Corps.]