Section 663(c) in Police Regulations, Bengal , 1943
(c)The Superintendent shall from time to time select officers who shall form the mobilization contingent. He shall take care that the Sub-Inspectors selected have the requisite qualifications for such commands and that the men are those most likely to be suitable; if the Special Armed Force of the district is not composed of Gurkhas or Garhwalis, he should select men who have recently served in the Special Armed Force. All selections shall be communicated to the officer-in-charge of each police-station concerned in B. P. Form No. 140.