The participants come primarily from Europe and the US; indeed, when the conference began in 1963, it was focused entirely on NATO members. This year, however, senior government officials from Brazil, China, India, Nigeria, Singapore, Qatar, and Saudi Arabia also joined, an important sign of the times.
与会者主要来自欧洲和美国；事实上，这一始于1963年的会议一开始完全是北约成员国的内部会议。不过，今年巴西、中国、印度、尼日利亚、新加坡、卡塔尔和沙特的高级政府官员也参与其中，这是一个重要的时代信号。