The Organization of Special Combat Actions (Osa–Kosa 30)[a] was a unit of the Polish Home Army tasked with special operations, active from May 1942 to July 1943.
Osa was a deeply clandestine unit under the direct command of the Home Army's Chief Commander, carrying out combat missions on his orders. Initially, its operations were confined to the General Government area. In December 1942, its operational range was extended to the territory of the Third Reich. The unit's tasks included the elimination of high-ranking Nazi officials and conducting major sabotage activities. In February 1943, Osa was incorporated into the structures of Kedyw, and its name was changed to Kosa 30. However, it retained its structure, almost unchanged personnel, and a high degree of autonomy.
The soldiers of Osa–Kosa 30 carried out several combat operations, including an unsuccessful attempt to assassinate the Higher SS and Police Leader in the General Government, Friedrich-Wilhelm Krüger, and bombing attacks in Berlin and Wrocław. The unit was dismantled after the Gestapo arrested several dozen of its soldiers on 5 June 1943, who were attending a comrade's wedding at St. Alexander's Church in Warsaw.
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