Section 4(d) in The Indian Reserve Forces Rules, 1925
(d)Viceroy's Commissioned Officers of the reserve will rank among themselves according to the dates of their commissions and, when employed on army service, will rank with Viceroy's Commissioned Officers of corresponding rank in the Indian Army, but as Juniors of each rank. Viceroy's Commissioned Officers commissioned under Cl. (a) will exercise no military command except over persons belonging or attached to the Indian Army Service Corps.
