Conversation so far:
What position did Ghulam Ishaq Khan hold in 1975?
Defence Secretary
How long was Ghulam Ishaq Khan the ministry of defence?
In 1975, Prime Minister Bhutto subsequently removed Khan from the State Bank, instead posting him at the Ministry of Defence. Khan was appointed Defence Secretary from 195 to 1977.
Did Ghulam Ishaq Khan hold any other positions besides defence secretary?
Yes, Minister of Finance (1977–85)

Question: What did he do as ministry of defense?
Self-contained rewrite: What did Ghulam Ishaq Khan do as ministry of defense?