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His public service includes four years at the Department of Defense from 1973 to 1977 , serving for two years as principal deputy director of telecommunications and command and control systems , and two years as staff specialist for Worldwide Command and Control Systems in the Office of the Secretary of Defense . The Governor General was replaced by a President.The Constitution of 1973Zulfiqar Ali Bhutto , President from 1971 to 1977 , lifted martial law within several months after his election , and after an " interim Constitution " granting him broad powers as President , a new Constitution was promulgated in April 1973 and came into effect on August 14 of that year , the twenty-sixth anniversary of the country 's independence . He served in that post from 1973 to 1977 , when he retired .