RLB, RDB and Wehrmacht grouping - City inspector

Document grouping issued to Hermann Haferkamp, a resident of the city of Duisburg. Includes:

• Reichsluftschutzbund (RLB) membership booklet, issued in 1937 to Herr Haferkamp. It contains membership stamps from 1937 to 1943. Well filled-in, comes with a post-WW2 hotel / restaurant receipt. 
• Reichsbundes der Deutschen Beamtem, RDB (Reich organization of public employees) membership ID card, issued to Hermann Haferkamp, from the city of Duisburg. He worked as a “city inspector” (Stadtinspektor). It contains payment stamps from 1934-36.
• Wehrmacht summons sheet (Behelfs - Musterungsausweis), dated May 1944. It mentions that he was excused from military service, probably due to his employment and age (60 years old).