149402
Used extensively by the United States Navy during the 1950s in the gunnery training role , the KD6G-2 was redesignated in 1963 in the new unified missile sequence , becoming the MQM-40A before being retired soon thereafter .
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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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