23485
All of the aircraft commence an attack flight on the USSR and set their radios to allow communications only through their CRM 114 discriminators , which was designed to accept only communications preceded by a secret three-letter code known only to General Ripper .
 location: USSR
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: USSR 
Answer:
 location: USSR