Question: Before being the United States Secretary of State who did Dean Rusk send official diplomatic correspondence too?

full_context: Document 1: Robert Suettinger: Robert Suettinger was United States President Bill Clinton's national intelligence officer for East Asia at the National Intelligence Council (NIC) from 1997-1998. While there, Suettinger oversaw the preparation of national intelligence estimates for the director of the Central Intelligence Agency. His areas of specialty included the People's Republic of China and the North Korean nuclear weapons program. After working in the Clinton administration, Suettinger has been a senior analyst for the Brookings Institution where he wrote the book "Beyond Tiananmen – The Politics of U.S.-China Relations, 1989-2000". He also is a senior advisor at The Stimson Center.
Document 2: David Rusk: David Patrick Rusk (born c. 1940) is an American politician. He served as mayor of Albuquerque, New Mexico from 1977 to 1981. He is the son of former United States Secretary of State Dean Rusk. Rusk is an alumnus of the University of California, Berkeley.
Document 3: Lyndon B. Johnson: Lyndon Baines Johnson ( ; August 27, 1908January 22, 1973), often referred to as LBJ, was an American politician who served as the 36th President of the United States from 1963 to 1969, assuming the office after serving as the 37th Vice President of the United States from 1961 to 1963. A Democrat from Texas, he also served as a United States Representative and as the Majority Leader in the United States Senate. Johnson is one of only four people who have served in all four federal elected positions.
Document 4: John Foster Dulles: John Foster Dulles ( ; February 25, 1888May 24, 1959) served as United States Secretary of State under Republican President Dwight D. Eisenhower from 1953 to 1959. He was a significant figure in the early Cold War era, advocating an aggressive stance against Communism throughout the world.
Document 5: United States Assistant Secretary of State: Assistant Secretary of State (A/S) is a title used for many executive positions in the United States Department of State, ranking below the Under Secretaries. A set of six Assistant Secretaries reporting to the Under Secretary for Political Affairs manage diplomatic missions within their designated geographic regions, plus one Assistant Secretary dealing with international organizations. Assistant Secretaries usually manage individual bureaus of the Department of State. When the manager of a bureau or another agency holds a title other than Assistant Secretary, such as "Director," it can be said to be of "Assistant Secretary equivalent rank." Assistant Secretaries typically have a set of deputies, referred to as Deputy Assistant Secretaries (DAS).
Document 6: Dean Rusk: David Dean Rusk (February 9, 1909December 20, 1994) was the United States Secretary of State from 1961 to 1969 under presidents John F. Kennedy and Lyndon B. Johnson. Rusk is one of the longest serving U.S. Secretaries of State, behind only Cordell Hull.
Document 7: South Korea–United States relations: Republic of Korea–United States relations (Hangul: 한미 관계 ; Hanja: 韓美 關係 ; RR: "Hanmi gwangye "; MR: "Hanmi kwan'gye " ) have been extensive since 1950, when the United States helped establish the modern state of South Korea, also known as the Republic of Korea, and fought on its UN-sponsored side in the Korean War (1950–1953). During the subsequent four decades, South Korea experienced tremendous economic, political and military growth, and significantly reduced U.S. dependency. From Roh Tae-woo's administration to Roh Moo-hyun's administration, South Korea sought to establish an American partnership, which has made the Seoul–Washington relationship subject to some strains, especially with the Anti-US/Korean sentiments. However, relations between the United States and South Korea have greatly strengthened under the conservative, pro-U.S. Lee Myung-bak administration. At the 2009 G-20 London Summit, U.S. President Barack Obama called South Korea "one of America's closest allies and greatest friends." In addition, South Korea has been designated as a Major non-NATO ally.
Document 8: John F. Kennedy: John Fitzgerald "Jack" Kennedy (May 29, 1917 – November 22, 1963), commonly referred to by his initials JFK, was an American statesman who served as the 35th President of the United States from January 1961 until his assassination in November 1963. Kennedy served at the height of the Cold War, and much of his presidency focused on managing relations with the Soviet Union. He was a member of the Democratic Party who represented Massachusetts in the United States House of Representatives and the United States Senate prior to becoming president.
Document 9: Robert F. Kennedy: Robert Francis "Bobby" Kennedy (November 20, 1925 – June 6, 1968) was an American politician and lawyer from Massachusetts. He served as the United States junior senator from New York from January 1965 until his assassination in June 1968. He was previously the 64th U.S. Attorney General from January 1961 to September 1964, serving under his older brother President John F. Kennedy and his successor, President Lyndon B. Johnson. Kennedy was a member of the Democratic Party, and is seen as an icon of modern American liberalism.
Document 10: Cable 243: DEPTEL 243, also known as Telegram 243, the August 24 cable or most commonly Cable 243, was a high-profile message sent on August 24, 1963, by the United States Department of State to Henry Cabot Lodge, Jr., the US ambassador to South Vietnam. The cable came in the wake of the midnight raids on August 21 by the regime of Ngo Dinh Diem against Buddhist pagodas across the country, in which hundreds were believed to have been killed. The raids were orchestrated by Diem's brother Ngô Đình Nhu and precipitated a change in US policy. The cable declared that Washington would no longer tolerate Nhu remaining in a position of power and ordered Lodge to pressure Diem to remove his brother. It said that if Diem refused, the Americans would explore the possibility for alternative leadership in South Vietnam. In effect, the cable authorized Lodge to give the green light to Army of the Republic of Vietnam (ARVN) officers to launch a coup against Diem if he did not willingly remove Nhu from power. The cable marked a turning point in US-Diem relations and was described in the Pentagon Papers as "controversial". Historian John W. Newman described it as "the single most controversial cable of the Vietnam War".
Document 11: David Powers: David Francis Powers (April 25, 1912 – March 27, 1998) was Special Assistant and assistant Appointments Secretary to President of the United States John F. Kennedy. Powers served as Museum Curator of the John F. Kennedy Library and Museum from 1964 until his retirement in May 1994. Powers was a military veteran who had served in the U.S. Army Air Corps during World War II from 1942 to 1945. Powers was also a very close, personal friend of John F. Kennedy.
Document 12: Robert McNamara: Robert Strange McNamara (June 9, 1916 – July 6, 2009) was an American business executive and the eighth Secretary of Defense, serving from 1961 to 1968 under Presidents John F. Kennedy and Lyndon B. Johnson. He played a major role in escalating the United States involvement in the Vietnam War. McNamara was responsible for the institution of systems analysis in public policy, which developed into the discipline known today as policy analysis.
Document 13: Clark Clifford: Clark McAdams Clifford (December 25, 1906October 10, 1998) was an American lawyer who served as an important political adviser to Democratic Presidents Harry S. Truman, John F. Kennedy, Lyndon B. Johnson and Jimmy Carter. His official government positions were White House Counsel (1946–1950), Chairman of the President's Intelligence Advisory Board (1963–1968), and Secretary of Defense (1968–1969); Clifford was also influential in his role as an unofficial, informal presidential adviser in various issues. A successful Washington lawyer, he was known for his elite clientele, charming manners and impeccable suits.
Document 14: Rusk documents: The Rusk documents (also known as the Rusk–Yang correspondence) are the official diplomatic correspondence sent by Dean Rusk, the United States Assistant Secretary of State for Far Eastern Affairs, to Yang You Chan (양유찬, 梁裕燦), the South Korean ambassador to the U.S at the August 10, 1951.
Document 15: Yerzhan Ashikbayev: Yerzhan Ashikbayev ( Ержан Ашықбаев, born in Almaty) is the Deputy Foreign Minister of the Republic of Kazakhstan. He was appointed in 2013. Previously, he served as Deputy Head of the Prime Minister's office, Head of Foreign Policy at the office of the President, and Head of the Foreign Minister's Chancellery. In his role as deputy foreign minister, Mr. Ashikbayev is the Kazakhstan's diplomatic point person matters of the United Nations and the Americas. Mr. Ashikbayev is a lead communicator on the Strategic Partnership Dialogue with the United States.
ground_truth: Yang You Chan