Border Security Force, the largest Border Guarding Force of the world was raised on 1ST Dec 1965. Tasked with inculcating a sense of security, preventing trans\-border crimes and smuggling, the force also has a war time role as the first line of defence. This book aims to highlight the role played by the force in ensuring security and integrity of the country about which there is very limited information available in public domain. The force besides guarding the borders has played an important role in controlling militancy in North East, Kashmir, and Punjab. A large strength of the force is presently deployed in central India in Anti Maoist operations. The force also has played an active role in 1971 war with Pakistan, liberation of Bangladesh and Kargil Operations. Force is frequently deployed to assist the civil administration in smooth conduct of Parliament, Legislative assembly and other elections.