What is the relationship between Boeing and United Launch Alliance 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.

Lockheed Martin , Boeing – The two companies saw their United Launch Alliance joint venture win a $882 million contract to continue launching satellites for the Air Force.

Answer: owner_of