It took some time for the armed battalions to evolve. So while the Eastern Frontier Rifles (EFR) started off early in 1907 (having been raised in Dacca as Eastern Bengal Assam Military Police and subsequently being renamed as EFR in 1920), a number of West Bengal Rifles (WBR) and Indian Armed Reserve Force (IARF) Battalions were set up, soon after Independence, primarily for guarding the Indo East Pakistan Border. The Special Striking Reserve Force (now the 6th Bn. State Armed Police Battalion) and a Coal India Limited Battalion (now 7th Bn. SAP) were also formed. From around the early 1960s, these WBRs and IARFs were re-designated as State Armed Police Battalion. The EFR grew from one battalion to three over these years. At present, there are 12 state Armed Police Battalions, two India Reserve Battalions (the 5th Bn. SAP was demobilized) and three EFR Bns., located at different places in West Bengal.
a) Support to districts for general low intensity law and order (both short term and long term duration) as well as for higher intensity law and order duties (performed by four coys. of Rapid Action Force)
b) Support to districts in Anti Dacoity Prevention Camp duties.
c) Support to districts for VIP security and vital installation guard duties, including the elite SSW, IB set up for CMs security.
d) Support to districts of Western Zone for anti extremist operations (recently, fourteen companies have been converted to STRACO or specially trained companies).
e) Support to various offices and officers of West Bengal Police for security guard and office duty requirements.
f) Inter state currency chest Escort duties.
g) Training of recruit constables at STCs at Sandhya (9th Bn.) and Kasba (4th Bn.) as well as of inductees into RAF (at EFR, Salua).
On behalf of the DGP, WB, the DIG (AP) Cell, Barrackpore looks after :
While the above mentioned duties are in respect of entire West Bengal, the DIG AP, Barrackpore also co ordinates and supervises local Brigade facilities like Brigade Security, Brigade Accommodation and Brigade Hospital.