Field marshal (or field-marshal, abbreviated as FM or FMoP) is a five-star honorary rank in Pakistan Army awarded by the Islamic Republic of Pakistan to chief of army staff in recognition of distinguished service such as a major victory in a combat battle (a wartime victory). It is the highest rank in Pakistan uniformed services that ranks above general as well as air chief marshal and below none. Although it is a current and authorized rank with a pay grade of "Apex Scale", it has been used one-off throughout its history and no Pakistani armed officer presently holds it, with the erstwhile and last field marshal being Ayub Khan, who was promoted to the rank in 1965. It comes with no additional powers and pay grade, but an honorary rank with a NATO's equivalent rank code OF-10. It is equivalent to fleet admiral, and while it is an ordinarily senior rank in Pakistan army, it can be refer as five-star general "standard rank scale" to distinguish it from other military insignias.