11973
In conjunction with the 1926 redesignation of the Army Air Service as the  Army Air Corps  the Air Service Tactical School became the  Air Corps Tactical School  .
 alternate names: Army Air Corps, Air Corps Tactical School
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Army Air Corps, Air Corps Tactical School 
Answer:
 alternate names: Army Air Corps, Air Corps Tactical School