Utilize the input text as a context reference, choose the right relationship between Comerica and DETROIT from the options. Options: 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.

DETROIT - General Motors is partnering with the Detroit Tigers, Michigan Veterans Affairs Agency (MVAA), U.S. Chamber of Commerce and more than 50 local employers at a Hiring Our Heroes job fair and career training workshop for U.S. military veterans and their families today at Comerica Park.

Answer: location_of_formation