652
HMX-1 in addition to its tactical development mission flies the President of the  United States  and provides helicopter support for the  Marine Corps Combat Development Command  .
 country of headquarters: United States, Marine Corps Combat Development Command
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: United States, Marine Corps Combat Development Command