The ILRS was formed on 25 December 1941, and comprised four patrols: 'J' (Jat), 'P' (Punjabi), 'M' (Muslim) and 'S' (Sikh). In December 1941, when 'J' and 'R' (Rajput) patrols were attached to the LRDG, their designations were changed to 'I1' and 'I2' to avoid confusion with the New Zealand 'R' Patrol. In October 1942, the other two Indian patrols, 'M' and 'S', were also attached to the LRDG and became 'I3' and 'I4' patrols.
