The Frontier Force Regiment of the Pakistan Army consists of battalions with their own history.
They are known as Piffers in reference to the former Punjab Irregular Force (PIF) formed by the British in 1851.
Only the 5th Gorkha Rifles (Frontier Force), and the 2nd Derajat and 4th (Hazara) Mountain Batteries went to India.
Since formation in 1956, the battalions have been known officially by their ordinal number followed by the legend "FF".
However, since many of the original fifteen battalions were from prior regiments, they were raised under different names, which are indicated.