 Complete the following phrase:  As originally established, the Registration Department was not directly subordinate to the General Staff at the time called the Red Army Field Staff  Polevoi Shtab. Administratively, it was the Third Department of the Field Staffs Operations Directorate. In July 1920, the RU was made the second of four main departments in the Operations Directorate. Until 1921, it was usually called the Registrupr Registration Department. That year, following the 