He hauled down his flag at Pearl Harbor on 26 Nov. 1945, and on 15 December relieved Fleet Admiral E.J. King as Chief of Naval Operations for a term of two years. On 01 January 1948, he reported as special Assistant to the Secretary of the Navy in the Western Sea Frontier. In March of 1949, he was nominated as Plebiscite Administrator for Kashmir under the United Nations. When that did not materialize he asked to be relieved and accepted an assignment as a roving goodwill ambassador of the United nations, to explain to the public the major issues confronting the U.N. In 1951, President Truman appointed him as Chairman of the nine-man commission on International Security and Industrial Rights. This commission never got underway because Congress never passed appropriate legislation.
Full article: http://www.history.navy.mil/faqs/faq36-4.htm