Lastly , I would like to express my appreciation to the women and men of the humanitarian community who work in often challenging conditions in Darfur to assist and improve the lives of people in need . I have the honour to refer to my letter of 7 October 2013 ( S/2013/591 ) , in which I proposed the establishment of an Organization for the Prohibition of Chemical Weapons ( OPCW ) -United Nations Joint Mission to eliminate the chemical weapons programme of the Syrian Arab Republic and the appointment of a civilian Special Coordinator at the level of Under-Secretary-General . I also have the honour to refer to your letter of 11 October 2013 ( S/2013/603 ) authorizing the establishment of the OPCW-United Nations Joint Mission .