Section 660(f) in Police Regulations, Bengal , 1943
(f)In the rank of constable there is a casualty reserve calculated at a percentage (which varies with the healthiness of the district) of the sanctioned number of Assistant Sub-Inspectors, head constables and constables. It provides for all vacancies in the ranks of such officers, whether caused by the grant of leave (including hospital leave) or by any other casualty such as training at the Training College, suspension, or (until new appointments are made) retirement, death, resignation and dismissal.
