Question: Field Marshal Alan Francis Brooke, 1st Viscount Alanbrooke, & Bar, was a senior officer of the British Army, As chairman of the Chiefs of Staff Committee, Brooke was the foremost military advisor to which British Prime Minister, and had the role of co-ordinator of the British military efforts in the Allies' victory in 1945, who was this British statesman, army officer, and writer?

Context paragraphs:
Statue of the Viscount Montgomery, London: The statue of Bernard Montgomery, 1st Viscount Montgomery of Alamein is located outside the Ministry of Defence Main Building in Whitehall, London, United Kingdom.  It was designed by Oscar Nemon and stands alongside statues of William Slim, 1st Viscount Slim and Alan Brooke, 1st Viscount Alanbrooke.

Winston Churchill: Sir Winston Leonard Spencer-Churchill, {'1': ", '2': ", '3': ", '4': "} (30 November 187424 January 1965) was a British statesman, army officer, and writer.  He served as Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955.  As a Member of Parliament (MP), he represented five constituencies over the course of his career.  As Prime Minister, Churchill led Britain to victory during World War II.  He led the Conservative Party for fifteen years from 1940 to 1955.

Joint Chiefs of Staff Committee: The Joint Chiefs of Staff Committee (Urdu: جوانٹ چيفس ﺁف اسٹاف كميٹى‎ ; JCSC), is an administrative body of senior high-ranking uniformed military leaders of the unified Pakistan Armed Forces who advises the civilian Government of Pakistan, National Security Council, Defence Minister, President and Prime minister of Pakistan on important military and non-military strategic matters.  It is defined by statute, and consists of a Chairman, the military chiefs from Army, Navy and the Air Force: all four-star officers appointed by the President, on the advice of the Prime minister.  The chairman is selected based on seniority and merit from the Chiefs of service of the three branches of the Pakistan Armed and Defense Services.  Each service chief, outside of their Joint Chiefs of Staff obligations, performs their duty directly for the Ministry of Defence.

Victor Brooke: Sir Victor Alexander Brooke, 3rd Baronet (5 January 1843 – 27 November 1891), was an Anglo-Irish naturalist and baronet.  He was the father of Field Marshal Alan Brooke, 1st Viscount Alanbrooke, and grandfather of Basil Brooke, 1st Viscount Brookeborough, third Prime Minister of Northern Ireland

Herbert Plumer, 1st Viscount Plumer: Field Marshal Herbert Charles Onslow Plumer, 1st Viscount Plumer, {'1': ", '2': ", '3': ", '4': "} (13 March 1857 – 16 July 1932) was a senior British Army officer of the First World War.  After commanding V Corps at the Second Battle of Ypres in April 1915, he took command of the Second Army in May 1915 and in June 1917 won an overwhelming victory over the German Army at the Battle of Messines, which started with the simultaneous explosion of a series of mines placed by the Royal Engineers' tunnelling companies beneath German lines, which created 19 large craters and was described as the "loudest explosion in human history".  He later served as Commander-in-Chief of the British Army of the Rhine and then as Governor of Malta before becoming High Commissioner of the British Mandate for Palestine in 1925 and retiring in 1928.

Chairman Joint Chiefs of Staff Committee: The Chairman of the Joint Chiefs of Staff Committee of Pakistan is, in principle, the highest-ranking military officer in the Pakistan Defense Forces, and the principal military advisor to the Prime minister of Pakistan, Parliament of Pakistan, Ministry of Defence, and the National Security Council.  The Chairman leads the meetings and coordinates the efforts of the Joint Chiefs of Staff Committee (JCSC), comprising the Chairman, the Chief of Army Staff and Chief of Air Staff and the Chief of Naval Staff.

Alan Brooke, 1st Viscount Alanbrooke: Field Marshal Alan Francis Brooke, 1st Viscount Alanbrooke, & Bar (23 July 1883 – 17 June 1963) was a senior officer of the British Army.  He was Chief of the Imperial General Staff, the professional head of the British Army, during the Second World War, and was promoted to field marshal in 1944.  As chairman of the Chiefs of Staff Committee, Brooke was the foremost military advisor to Winston Churchill, the British Prime Minister, and had the role of co-ordinator of the British military efforts in the Allies' victory in 1945.  After retiring from the army, he served as Lord High Constable of England during the Coronation of Queen Elizabeth II in 1953.  His war diaries attracted attention for their criticism of Churchill and for Brooke's forthright views on other leading figures of the war.

Viscount Alanbrooke: Viscount Alanbrooke, of Brookeborough in the County of Fermanagh, is a title in the Peerage of the United Kingdom.  It was created on 29 January 1946 for Field Marshal Alan Brooke, 1st Baron Alanbrooke.  He had already been created Baron Alanbrooke, of Brookeborough in the County of Fermanagh, on 18 September 1945, also in the Peerage of the United Kingdom.  Brooke was the sixth son of Sir Victor Brooke, 3rd Baronet, and the uncle of Sir Basil Brooke, 5th Bt.  (created Viscount Brookeborough in 1952), the Prime Minister of Northern Ireland from May 1943 until March 1963.  Field Marshal Lord Alanbrooke was succeeded by his elder son, Thomas, who was unmarried and had no children.  s of 2017 the titles are held by his half-brother, Alan Brooke's younger son, also named Alan.  Lord Alanbrooke is also in remainder to the Brooke Baronetcy of Colebrooke, a title held by his Ulster kinsman, The 3rd Viscount Brookeborough.

Thomas Brooke, 2nd Viscount Alanbrooke: The Rt.  Hon. Thomas Brooke, 2nd Viscount Alanbrooke (9 January 1920 – 19 December 1972), was a British peer.  He was the son of Field Marshal The 1st Viscount Alanbrooke.

Chief of Staff of the United States Army: The Chief of Staff of the Army (CSA) is a statutory office ( /3033 § 3033  ) held by a four-star general in the United States Army.  As the most senior uniformed officer assigned to serve in the Department of the Army, the CSA is the principal military advisor and a deputy to the Secretary of the Army.  In a separate capacity, the CSA is a member of the Joint Chiefs of Staff ( /151 § 151  ) and, thereby, a military advisor to the National Security Council, the Secretary of Defense, and the President of the United States.  The CSA is typically the highest-ranking officer on active-duty in the U.S. Army unless the Chairman and/or the Vice Chairman of the Joint Chiefs of Staff are Army officers.

Supporting paragraphs: Alan Brooke, 1st Viscount Alanbrooke Winston Churchill
Answer: Winston Leonard Spencer-Churchill