The year 1975 was a twofold anniversary year for the International Tracing Service (ITS). Not only was it the thirtieth year of that unique international Service's existence; it was also the twentieth year of the ICRC's presence in Arolsen. To mark the thirtieth anniversary a short ceremony took place on 6 May in the main hall of the ITS. Each member of the staff was presented with a copy of the booklet published for the occasion.