The early Red Army abandoned the institution of a professional officer corps as a "heritage of tsarism" in the course of the Revolution. In particular, the Bolsheviks condemned the use of the word "officer" and used the word "commander" instead. The Red Army abandoned epaulettes and ranks, using purely functional titles such as "Division Commander", "Corps Commander", and similar titles. In 1924 it supplemented this system with "service categories", from K-1 (lowest) to K-14 (highest). The service categories essentially operated as ranks in disguise: they indicated the experience and qualifications of a commander. The insignia now denoted the category, not the position of a commander. However, one still had to use functional titles to address commanders, which could become as awkward as "comrade deputy head-of-staff of corps". If one did not know a commander's position, one used one of the possible positions - for example: "Regiment Commander" for K-9.

On September 22, 1935 the Red Army abandoned service categories and introduced personal ranks. These ranks, however, used a unique mix of functional titles and traditional ranks. For example, the ranks included "Lieutenant" and "Komdiv" (Комдив, Division Commander). Further complications ensued from the functional and categorical ranks for political officers (e.g., "Brigade Commissar", "Army Commissar 2nd Rank"), for technical corps (e.g., "Engineer 3rd Rank", "Division Engineer"), for administrative, medical and other non-combatant branches.