 Upon returning to Pakistan, he was promoted as lieutenant, and was posted as executive officer to which he served until 1961.During this time, he was posted in East Pakistan but return shortly after Lt. Tasnim was appointed as ADC to President Ayub Khan.In 1963, Lt. Tasnim personally excused himself from his assignment in order to join the newly established crew that was to be trained in the United States in order to operate the submarine acquired from the United States Navy.