5263
18 September 1947 however is considered the  Idaho Air National Guard  's official birth concurrent with the establishment of the  United States  Air Force as a separate branch of the United States military under the National Security Act .
 country of headquarters: Idaho Air National Guard, United States
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:  Idaho Air National Guard, United States 
Answer:
 country of headquarters: Idaho Air National Guard, United States