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He also took part in the Invasions of the Balkans ( Operation Marita ) and the Soviet Union ( Operation Barbarossa ) where he was awarded the Eastern Front Medal .
 Balkans, Soviet Union
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Balkans, Soviet Union