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He was also an expert Colonial Viper pilot , and had pulled a tour of duty in the frozen environment of Ice Station Thule ; this made Boomer useful for similar missions in the series , such as in the episode Gun on Ice Planet Zero .
 None
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:  
Answer:
 None