The main reason for the long period between signature and ratification by the United States were the reservations of the US Department of Defense during the Cold War, that the Convention's obligations regarding the possible use of nuclear weapons could not be fulfilled. The Joint Chiefs of Staff, to which the commanders-in-chief of all units of the American armed forces belong, unanimously declared itself in 1995 in favour of voluntary compliance with the Convention. On 6 January 1999, then US President Bill Clinton recommended that the US Senate ratify both agreements. In his opinion, they were not only in accordance with the principles and methods of the American Armed Forces, but were even based on them in essential aspects. After the Senate approved accession in September 2008, the US Ambassador to UNESCO, Stephen Engelken, handed over the instrument of ratification to Kōichirō Matsuura, Secretary-General of UNESCO on 13 March 2009. On the occasion of the 50th anniversary of the signing of the Convention on 14 May 2004, the Government of the United Kingdom declared its intention to become a party to the Convention and the two Protocols. This was due to the conclusion of the Second Protocol of 1999, which, in the view of the British government, eliminated essential weaknesses and ambiguities of the 1954 Convention. A draft law containing ratification of the Convention, the two protocols and criminal law provisions was announced by the UK government in November 2006.