Mains Examination: General Studies-III: Challenges to internal security through communication networks, role of media and social networking sites in internal security challenges, basics of cyber security; money-laundering and its prevention. What’s the ongoing story: Defence Minister Rajnath Singh on Friday described Operation Sindoor as a “short-duration, deep-penetration, high-intensity, and high-impact operation” which showcased India’s ability to compel its adversary to surrender. — How has modern warfare changed? — What are the challenges of modern warfare? — What are unified theatre commands? — What is the need of the unified theatre commands? — What is India’s expenditure on the defence sector? — What is the main objective of formulating the National Military Strategy?…