In 1970–71, Lt-Cdr. Shamoon moved his ISI office in Comilla, and took participation in briefing the formations of Pakistan Marines and special forces of Army and Navy to commence offence on approaching Indian Army. During the height of the civil insurgency in East-Pakistan, Lt-Cdr. Shamoon volunteered into the entrance in the Navy Special Service Group and was a commanding officer of the Navy SEAL Team that conducted a reconnaissance mission to gain knowledge on the Indian Army's movement near at the Rangamati, leading to insert the Pakistan Marines battalions, and later made a way to secure intelligence on the Kaptai Dam.