In the Netherlands, the Germans managed to exterminate a relatively large proportion of the Jews. They were found more easily because before the war the Dutch authorities had required citizens to register their religion so that church taxes could be distributed among the various religious organizations. Furthermore, shortly after the Nazis took over the government, they demanded all Dutch public servants fill out an "Aryan Attestation" in which they were asked to state in detail their religious and ethnic ancestry. The American author Mark Klempner writes, "Though there was some protest, not just from the government employees, but from several churches and universities, in the end, all but twenty of 240,000 Dutch civil servants signed and returned the form." In addition, the country was occupied by the oppressive SS rather than the "Wehrmacht" as in the other Western European countries, as well as the fact that the occupying forces were generally under the command of Austrians who were keen to show that they were 'good Germans' by implementing anti-Semitic policy. The Dutch public transport organization and the police collaborated to a large extent in the transportation of the Jews.