With the signing of the North American Air Defence Modernization agreement at the "Shamrock Summit" between Prime Minister Mulroney and President Reagan in Quebec City on 18 March 1985, the DEW Line began its eventual upgrading and transition becoming the North Warning System (NWS) of today. The intermediate sites were closed in 1963 due to the advancements in radar technology. Operational NWS sites have retained their former DEW Line designations. The Canadian NWS sites are under the jurisdiction of the NORAD Canada West ROCC at CFB North Bay Ontario; Barter Island is under the jurisdiction of the Alaska NORAD Region ROCC at Elmendorf AFB.