The correct answer is Border Security Force (BSF). In News • The Border Security Force (BSF) has deployed an anti-tunnelling system along the Punjab–Jammu border to detect and prevent cross-border tunnels used for smuggling weapons, drugs, and facilitating terrorist infiltration. Explanation & Key Takeaways: • The system will provide real-time alerts of any underground tunnelling activity in border areas. • The development was announced by ADG (Western Command) Satish S. Khandare during the BSF Diamond Jubilee celebrations. • BSF has been pivotal in countering Pakistani aggression during ‘Operation Sindoor’, including neutralising drones and thwarting infiltration. • In 2025, BSF apprehended 53 Pakistani intruders/smugglers while countering numerous cross-border threats. Related Concepts: • Border Security Force (BSF) • Formed on 1 December 1965 after the Indo-Pak War. • India’s “First Line of Defence” along the Pakistan and Bangladesh borders. • World’s largest border guarding force with nearly 290,000 personnel. • Operates under the Ministry of Home Affairs, headquartered in New Delhi. • Anti-Tunnelling System • Sensor-based technology designed to detect underground vibrations caused by tunnelling. • Helps identify cross-border tunnels used for smuggling, infiltration and terror activities. • Operation Sindoor • A major BSF operation where the force retaliated strongly to Pakistani aggression. • Included defending border posts, destroying enemy structures, and blocking infiltration routes. • BSF Drone Squadron • BSF is raising its first dedicated drone squadron for surveillance and attack missions along the India–Pakistan border. • Will operate under the Western Command from Chandigarh.