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Soon after leaving  ArmaLite  Eugene Stoner one of the  United States  ' most prolific modern military small arms designers responsible for the design of the AR-15 / M16 assault rifles AR-10 battle rifle and AR-5 survival rifle among others Kokalis Peter : Weapons Tests And Evaluations : The Best Of Soldier Of Fortune page 160 .
 country of headquarters: ArmaLite, United States
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 country of headquarters: ArmaLite, United States