At the end of 1933 26,000 postal employees had volunteered for the Postschutz. In 1937 an agreement between the Wehrmacht and the Postmaster General Wilhelm Ohnesorge established that in time of war 29,000 men from the Reichspost would be reserved for the Postschutz. In 1939 the Postschutz contained 40 000 men, and was also in charge of air raid precautions for the Reichspost.