Ministry of Defence (Pakistan) of the army, navy and air force in Pakistan until 1956. In December 1959, the federal capital shifted temporarily to Rawalpindi, while plans for Islamabad were drawn up by then-General Ayub Khan's military government. The proximity of the Army Headquarters in Rawalpindi played a major role in the decision to relocate the capital. In March 1972, President Zulfiqar Ali Bhutto in response to criticism over the difficulties in inter-service coordination in previous wars decreed that all service HQs were to move to Islamabad. The Navy was the first to comply, with Naval Headquarters moving from Karachi to Sector E9 Islamabad
Sectors of Islamabad all planned and constructed sectors. Sectors of Islamabad Sectors of Islamabad are administrative divisions of Zone I and Zone II of the Islamabad Capital Territory region. The capital territory is divided into 5 zones, of which Zone I and Zone II have been designated urban development zones. Each square shaped sector is named by combining Latin letters and numerals together. The sector letters increase north to south from A through O, while sector number increases east to west from 1 through 20. However, at present time, sectors A thru I and 5 thru 18 are currently open for urban development.