The 13th Frontier Force Rifles was part of the British Indian Army, and after 1947, Pakistan Army. It was formed in 1922 by amalgamation of five existing regiments and consisted of five regular battalions. In 1947, it was allocated to the Pakistan Army.

The 12th Frontier Force Regiment was formed in 1922 as part of the British Indian Army. It consisted of five regular battalions; numbered 1 to 5 and the 10th (Training) Battalion. During the Second World War a further ten battalions were raised. In 1945, the prenominal "12th" was dropped when the British Indian Army dispensed with prenominal numbering of its regiments. After the independence in 1947, it was formed into the Frontier Force Regiment, part of the army of Pakistan.