A Soviet DOSARM membership booklet here, dated 1950. While pages exist for payment of membership dues for the years of 1949-1956, there are no stamps present to signify payment. 
 
The DOSARM was the "All Union Volunteer Society for Assistance to the Army" and is described in official CIA documents as being "one of the mass workers' organizations of the USSR, through which millions of patriots are drawn into social work, which increases the power of the Soviet Army.