Llewellin returned to the United Kingdom at the end of 1943 and was replaced on the committee by Sir Ronald Ian Campbell, the deputy head of the British Mission to the United States, who in turn was replaced by the British Ambassador to the United States, Lord Halifax, in early 1945. Dill died in Washington on 4 November 1944, and was replaced both as Chief of the British Joint Staff Mission and as a member of the Combined Policy Committee by Field Marshal Sir Henry Maitland Wilson. It was therefore Wilson who, on 4 July 1945, under the clause of the Quebec Agreement that specified that nuclear weapons would not be used against another country without mutual consent, agreed that the use of nuclear weapons against Japan would be recorded as a decision of the Combined Policy Committee.