In 1971, he commanded an infantry regiment in third war with India but was sent back to attend the National Defence University where he became even more involved with his studies. In 1971–72, he earned his MSc in War Studies, defending and publishing his thesis, entitled: "A journey of pain and fear" which provide critical analysis of state sponsored terrorism and its effects on geo-military positions of the countries. Lt. Col. Beg left the special forces, and accepted the professorship on war studies at the NDU in 1975. Brig. Beg tenured as the professor on the war studies and remained Chief Instructor of Armed Forces War College at the then National Defence University until January 1978.