The 1940 Dunkirk Veterans' Association was an association of British service veterans "who served at Dunkirk and other ports of evacuation between 10 May and June 1940" - that is in the Dunkirk evacuation of 1940, including those who were taken prisoner. Associate membership was available to those "otherwise not qualified, but who had assisted at the ports of evacuation".
The association was formed at Leeds in 1953, reached a peak membership of over 20,000 and was disbanded on 30 June 2000, after the 60th anniversary commemoration.
References
1940 Dunkirk Veterans' Association Wikipedia(Text) CC BY-SA