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A third group , the 81st Fighter Group was assigned to the field in early January 1943 flying P-39 Aircobra s. Its ground echelon arrieved at the field in November , but the air echelon trained for several months in England .
 organization: 81st Fighter Group
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: 81st Fighter Group 
Answer:
 organization: 81st Fighter Group