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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  .
 United States, Marine Corps Combat Development Command
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 United States, Marine Corps Combat Development Command