Royal Army Dental Corp Reunion 50 Group. The RADC Reunion 50 Group was formed by Brian Harrison, the founder member, to maintain contact with old friends he had served with in the 1950’s, hence the 50 Group. The name was subsequently changed to the Reunion Club, but members prefer Reunion Group. The Group first met in 1989. It holds annual weekend events. The Reunion Group may be considered to be one of the social arms of the RADC Association. The Reunion Group tie was introduced soon after the formation of 50 Group.