Section 793(e) in Police Regulations, Bengal , 1943
(e)They shall be kept under training for a period of four months. All constables and naiks who pass the examination in drill on the completion of their course of instruction shall be granted a certificate of competency in drill in B. P. Form No. 155/E.F.R. Form No. 38. The Principal Police Training College, Commandant, Eastern Frontier Rifles, shall note which of those who obtain a drill certificate are suited to be drill instructors.