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The Bulgarian Air Force received 11 Do 17 M-1s and P-1s in 1940. After their participation in the Balkans Campaign against Yugoslavia and Greece, the Bulgarians were given 15 captured Yugoslav Do 17Ka-1s. These including spare parts, engines, and landing gear. The Dorniers were assigned to the 1./5. bombardirovicen orlijak (1st Squadron of the 5th Bomber Regiment). In the Bulgarian occupation zones of Yugoslavia, the Do 17s carried out missions against Yugoslav Chetniks and partisans in 1941–1944. They also supported Croatian forces in the same role. Another six Do 17Ms were received in 1943. In September 1944, the Bulgarians switched sides and declared war on their former ally, Germany. At this time they had 20 Do 17s of all types assigned to the 1./5. Bomber Group and five Do 17 Ps assigned to 3./1. Reconnaissance Squadron and another four Do 17 Ps assigned to 73. Long-range Reconnaissance Flight.

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