The censorship in the US zone was regulated by the occupation directive JCS 1067 (valid until July 1947) and in the May 1946 order valid for all zones (rescinded in 1950), Allied Control Authority Order No. 4, "No. 4 – Confiscation of Literature and Material of a Nazi and Militarist Nature". All confiscated literature was reduced to pulp instead of burning. It was also directed by Directive No. 30, "Liquidation of German Military and Nazi Memorials and Museums". An exception was made for tombstones "erected at the places where members of regular formations died on the field of battle".