Frederick James Kroesen, Jr. (born February 11, 1923) is a United States Army four-star general and was the Commanding General of the Seventh United States Army and the commander of NATO Central Army Group from 1979 to 1983, and Commanding General, United States Army Forces Command from 1976 to 1978.
 He also served as Vice Chief of Staff of the Army from 1978 to 1979.
 He commanded troops in World War II, the Korean War, and the Vietnam War, enabling him to be one of the very small number who ever was entitled to wear the Combat Infantryman Badge with two Stars, denoting active combat in three wars.
Carroll LeTellier (born 1928) was a US Army Major General and both a Korean War and Vietnam War combat veteran, serving with the US Army Corps of Engineers.
 As a Brigadier General (United States), he commanded ENGCOM, headquartered then in Frankfurt, Germany.
 In 1976, LeTellier retired from the military at the rank of Major general (United States) to a private civilian practice at Sverdrup Civil, Inc., the then 6th largest architecture and civil engineering firm in the United States, which he in turn retired from as vice president in 2002.
Creighton Williams Abrams Jr. (September 15, 1914 – September 4, 1974) was a United States Army general who commanded military operations in the Vietnam War from 1968–72 (which saw U.S. troop strength in South Vietnam fall from a peak of 543,000 to 49,000).
 He served as Chief of Staff of the United States Army from 1972 until shortly before his death in 1974.
 In 1980, the U.S. Army named its new main battle tank, the "M1 Abrams", after General Abrams.
 The IG Farben building in Germany was also named after him from 1975 to 1995.
Claude M. Kicklighter (born August 22, 1933) is a retired American Army Lieutenant General.
 He is a former commander of the United States Army Western Command (later United States Army Pacific), which he held from 1989 to 1991.
 He was also Director for Security Assistance for the US Army Security Assistance Center and Chief of Staff for the US Army Material Development and Readiness Command in Alexandria, Virginia, from 1981–1984 and Assistant Deputy Chief of Staff for Logistics and Director of the Army Staff for the Office of Chief of Staff in Washington, DC.
 Kicklighter was commander of the 25th Infantry Division from 1984 until being succeeded by James W. Crysel in 1986.
Brigadier General Joseph Warren Stilwell Jr. (March 6, 1912 – July 25, 1966) was a United States Army General best known for his service in United States Army Special Forces and the US Army Support Group in the Vietnam War.
Maj. Gen. Wilfred Charles Menard, Jr. (November 10, 1918 – February 20, 2012) (ARNG) was the twenty-sixth Adjutant General of New Jersey.
 Commissioned a US Army 2nd lieutenant in 1942, he served actively with the Army during the Second World War rising to the rank of US Army captain.
 He continued to serve thereafter as a reserve officer in the New Jersey Army National Guard, which he commanded from 1974-1982.
 A graduate of the United States Army Field Artillery School, the United States Army Tank Destroyer School, and the United States Army War College, Menard was an experienced artillery officer.
 During his service with the Guard, he was briefly reactivated at the rank of Lieutenant Colonel for the Berlin Crisis of 1961.
 Born in Trenton, NJ, Maj. Gen. Menard was a lifelong resident of central New Jersey.
 His many military awards and decorations include the Distinguished Service Medal (US Army) and the Legion of Merit.
Raymond Thomas "Ray" Odierno ( ; born 8 September 1954) is a retired United States Army General who served as the 38th Chief of Staff of the Army.
 Prior to his service as Chief of Staff, Odierno commanded United States Joint Forces Command from October 2010 until its disestablishment in August 2011.
 He served as Commanding General, United States Forces – Iraq and its predecessor, Multi-National Force – Iraq, from September 2008 through September 2010.
 Before then, he served as Commanding General, III Corps, from May 2006 to May 2008.
 Odierno is the twelfth American military officer to command at the Division, Corps, and Army level during the same conflict and only the second with this distinction since the Vietnam War.
 Before commanding III Corps, he served as Assistant to the Chairman of the Joint Chiefs of Staff in Washington, where he was the primary military adviser to Secretary of State Condoleezza Rice from 3 November 2004 to 1 May 2006.
Floyd Lavinius Parks (9 February 1896 – 10 March 1959) was a United States Army general during World War II.
 During the war, he was chief of staff of the US Army Ground Forces and the First Allied Airborne Army.
 As such, he participated in Operation Market Garden that directed air drops into the Netherlands behind the German lines which were preventing Allied forces from crossing the Rhine river.
 He commanded the US First Airborne Army in 1945 on his promotion to major general.
 After the war, Parks commanded the US Sector in Berlin before going to Washington D.C. to become the chief of the Public Information Division for the Army.
 Later, he commanded American forces in the US Army, Pacific in 1949.
 After service in Hawaii, he became chief of the Information Department, whereafter he was known as the "father of modern Army public affairs."
 He received a promotion to lieutenant general in 1953 and thereafter served as Commanding General for the Second United States Army until his retirement in 1956.
Joseph Alexander McChristian (October 12, 1914 – May 13, 2005) was a United States Army Brigadier General and the assistant chief of staff for intelligence, Military Assistance Command, Vietnam (J-2, MACV) (then commanded by General William Westmoreland) from July 13, 1965 to June 1, 1967.
William Childs Westmoreland (March 26, 1914 – July 18, 2005) was a United States Army general, who most notably commanded U.S. forces during the Vietnam War from 1964 to 1968.
 He served as Chief of Staff of the United States Army from 1968 to 1972.

Question: Which United States Army General commanded Joseph A. McChristian during the Vietnam war and later went on to serve as the chief of staff of the US Army?
Answer: William Westmoreland