 Since the 1950s the Pakistan Navy had been seeking to procure imported submarines, initially negotiating with the Royal Navy and subsequently also with the United States Navy.With Ayub administration improving relations with the Eisenhower administration in 1960, "Ghazi" was finally procured under the Security Assistance Program (SAP) authorized by the Kennedy administration on a four-year lease with an option of renewing or purchasing the submarine afterwards in 1963.