Ukrainian People's Revolutionary Army

Military History of Ukraine
Kievan Rus' Druzhyna (862–1240)
Kingdom of Galicia–Volhynia Voyi
Polish–Lithuanian Commonwealth Registered Cossacks Zaporozhian Cossacks (1492–1648)
Zaporizhian Host Zaporozhian Cossacks (1648–1775)
Austria-Hungary Legion of Sich Riflemen (1914–1918)
Ukrainian People's Republic Ukrainian People's Army (1917–21) Sich Riflemen (1917–21) Ukrainian Galician Army (1918–19)
Free Territory Revolutionary Insurrectionary Army (1918–1921)
Carpatho-Ukraine Carpathian Sich (1938-39)
Ukrainian National Government UPRA (1941–1944) Ukrainian Insurgent Army (1941–1955)
Ukrainian SSR Red Cossacks Ukrainian Soviet Army (1918–19) none (1919–1991), part of the Soviet Armed Forces
Ukraine Armed Forces (1992–Present) This box:

Ukrainian People's Revolutionary Army (Ukrainian: Українська народно-революційна армія; also Polissian Sich (Ukrainian: Поліська Січ) or the Ukrainian Insurgent Army) was a paramilitary formation of Ukrainian nationalists, nominally proclaimed in Olevsk region in December 1941 by Taras Bulba-Borovets by renaming an existing military unit known from July 1941 as the UPA-Polissian Sich (Poliska sich). It was a warlord-type military formation without a strict central command. From spring 1942 until the autumn of 1943 it acted against the German rural civil administration and warehouses, from spring 1943 it also fought against Soviet Partisans and some units against Poles; from July–August 1943 it clashed with OUN-B Bandera’s UPA and SB units.

To distinguish itself from Stepan Bandera's Ukrainian Insurgent Army, on July 20, 1943 it was renamed the Ukrainian People's Revolutionary Army. However, among the local population and Soviet partisans members of Bulba’s formation were always known as bulbovtsy (Russian) / bulbivtsi or bulbashi (Ukrainian).

By the end of June 1941 Taras Borovets, with support from German occupation forces officials, decided to create his own military formation. At the beginning of July 1941 he was nominated by the Germans to the post of Ukrainian militia commander at Sarny district. By the beginning of August 1941 he obtained German permission to create an armed military formation which he named as “The Polissian Sich”. The main tasks of this newly created formation was “ by the order of German military command … establishing a self defense against Bolshevik regular and partisan units”. Borovets' military formation obtained high praise from the Germans – they especially noted the cruel massacre of retreating Soviet Army soldiers which this formation had conducted earlier.

...
Wikipedia