sentences:  In 1988, Cdr Tahir was sent to attend the Joint Services Staff Course at Joint Services Staff College at Chaklala and upon completion of the course he was appointed to its Directing Staff.In 1990, he was promoted as captain and assumed the command of the naval air station, PNS Mehran before commanding the guided missile destroyer in 1992.He was nominated to attend the National Defence University where he gained master's degree in Strategic studies in 1997 and assumed the command of the Naval Aviation as its commander (COMNAV).