Khalid Jamil, and Commander M.A. Alavi. During this time, a number of goodwill missions were carried out by the navy's warships, and non-combat missions were conducted under the auspices of the Royal Navy. In 1951, HMS Choudhri's promotion papers as naval chief were approved by Prime Minister Liaquat Ali Khan but it was not until 1953 when HMS Choudhri was promoted as vice admiral and commander with the support from army commander-in-chief General Ayub Khan. He handed over the command of 25th Destroyer squadron to a Polish naval officer, Commander Romuald Nalecz-Tyminski. In the mid-1950s, the Ministry of Finance awarded contracts to the Corps of Engineers (Pakistan Army) for the construction of the Karachi Naval Dockyard. In 1954, several efforts were made to procure a Ch-class submarine from the Royal Navy but was rejected by British Admiralty which agreed to loan the , , which was renamed PNS Taimur. From 1953 to 1956, HMS Choudri bitterly negotiated with the United States over the modernisation of the navy and convinced the U.S. government to provide monetary support for modernisation of ageing O–class destroyers and minesweepers, while commissioning the Ch–class destroyers from the Royal Navy. British naval tradition was disbanded and cancelled when the United States Navy's advisers were dispatched to the Pakistani military in 1955. With the promulgation of the Constitution of Pakistan that established the republicanism featuring the federalised government, the prefix Royal was dropped, and the service was re-designated the Pakistan Navy ("PN") with the Jack replaced the Queen's colour and the White Ensign respectively in 1956. The order of precedence of the three services changed from Navy–Army–Air force to Army–Navy–Air Force. In February 1956, the British government announced the transfer of several major surface combat warships to Pakistan Navy, including a cruiser and four destroyers to be purchased with funds made available under the U.S. Military Assistance Program. In 1957, the Navy finalised the purchase of a cruiser from the United Kingdom and used the government's own funds for the purchase which caused a great ire against Admiral Choudhri in the Finance Ministry. In 1958, the Navy made an unsuccessful attempt to obtain s from Sweden using the American security funds; it was halted by the United States and Pakistan's Finance Ministry despite the fact that the idea had support from Army GHQ. In 1958–59, the Navy NHQ staff began quarrelling with the Army GHQ staff and the