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A RAND Corporation study for year 2003 estimated the People 's Republic of China 's defense spending to be higher than the official number but lower than United States Department of Defense calculations .
 RAND Corporation, People, United States Department of Defense
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 RAND Corporation, People, United States Department of Defense