What is the relationship between New Balance and BOSTON in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

BOSTON (AP) -- Footwear company New Balance says the military has been slow to deliver on its promise to outfit recruits in sneakers 100 percent made and manufactured in America.

Answer: headquarters_location