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The Air Force is reportedly considering purchasing several squadrons of Sukhoi Su - 27 interceptors , considered the world ' s premier dogfighters .
 organization: The Air Force; vehicle: several squadrons of Sukhoi Su - 27 interceptors , considered the world ' s premier dogfighters; vehicle: Sukhoi Su - 27; vehicle: the world ' s premier dogfighters; location: the world
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 organization: The Air Force; vehicle: several squadrons of Sukhoi Su - 27 interceptors , considered the world ' s premier dogfighters; vehicle: Sukhoi Su - 27; vehicle: the world ' s premier dogfighters; location: the world