19783
Commissioned into the Regular Army in 1920 , he attended the Air Corps Tactical School , and later became an instructor there .
 organization: Corps
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: Corps 
Answer:
 organization: Corps