Section 663(d) in Police Regulations, Bengal , 1943
(d)Against the name of each officer selected for the mobilization contingent there shall be entered in red ink the letter "M" -(i)in the register of disposition of force (B. P. Form No. 171) and in the gradation list (B. P. Form No. 173) kept in the Reserve office, and(ii)in the disposition list kept in each police-station.