361463
British officers that understood the language , customs , and psychology of their men could not be quickly replaced , and the alien environment of the Western Front had some effect on the soldiers .
 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