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NATO later called these arrangements an " air defence ground environment " , defined as " the network of ground radar sites and command and control centres within a specific theatre of operations which are used for the tactical control of air defence operations " .
 organization: NATO
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: NATO