"Division Engineer"), for administrative, medical and other non-combatant branches. Rank insignia then used both upside-down chevrons on the sleeve and collar marks. The rank of Marshal of the Soviet Union was also introduced. 1940–1943 On May 7, 1940, further modifications to the system took place. The ranks of "General" or "Admiral" replaced the senior functional ranks of Combrig, Comdiv, Comcor, Comandarm; the other senior functional ranks ("Division Commissar", "Division Engineer", etc.) remained unaffected. The Arm or Service distinctions remained (e.g. General of Cavalry, Marshal of Armoured Troops). On November 2, 1940, the system underwent further modification with the abolition of functional ranks for NCOs and the reintroduction of the Podpolkovnik (sub-colonel) rank. For the most part the new system restored that used by the Imperial Russian Army after its participation in World War I. In early 1942 all the functional ranks in technical and administrative corps became regularized ranks (e.g., "Engineer Major", "Engineer Colonel", "Captain Intendant Service", etc.). On October 9, 1942, the authorities abolished the system of military commissars, together with the commissar ranks, and they were completely integrated into the regular officer corps. The functional ranks remained only in the medical, veterinary, and legislative corps, and Private became the basic rank for the enlisted and NCOs. 1943–1955 In early 1943 a unification of the system saw the abolition of all the remaining functional ranks. The word "officer" became officially endorsed, together with the epaulettes that superseded the previous rank insignia, styled like the Imperial Russian Army before, and Marshal and Chief Marshal ranks created for the various arms and branch commands of the Red Army and the Red Army Air Forces save for the infantry (even through the Artillery branch was the first to have one in 1942) with all Marshal and Chief Marshal ranks being equal to General of the Army. The ranks and insignia of 1943 did not change much until the last days of the USSR; the contemporary Russian Ground Forces uses largely the same system. The old functional ranks of Combat (Battalion or Battery Commander), Combrig (Brigade Commander) and Comdiv (Division Commander) continue in informal use. After the war, the rank of Generalissimus of the Soviet Union was proposed to Joseph Stalin in his role as the Supreme Commander of the Armed Forces, however, he refused the proposal of the rank several times. The rank insignia featured the USSR arms above a large Marshal's