Starting in May 1935, Canaris first donned the uniform of a rear admiral, a promotion which coincided with his responsibility for shielding Germany's burgeoning rearmament program from enemy counter-intelligence agents. This meant a significant expansion of the "Abwehr". Enlargement of the "Abwehr" mission brought Canaris into contact with "counterespionage virtuoso" Major Rudolf Bamler, who assisted him in establishing an extensive surveillance web over munitions factories, seaports, the armed forces, and the media. During the period between 1935 and 1937, Canaris expanded the "Abwehr" staff from a mere 150 people to nearly a thousand. Meeting with Heydrich again on 21 December 1936, the two men signed a document which came to be known in their orbit as the "Ten Commandments"; the agreement clarified the respective areas of counter-espionage responsibilities between the Gestapo and the "Abwehr".