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The improved KD2G-2 , powered by a Solar PJ32 pulsejet , began production in 1950 ; it was the first successful jet-powered target drone to be developed following the end of World War II .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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