What is the relationship between Lockheed Martin and Marillyn Hewson 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.

“One of the key elements of our strategic planning is to secure and extend our core defense business and we feel confident that the addition of Sikorksy will contribute significantly to the growth objective,” Lockheed Martin CEO Marillyn Hewson said during a conference call.

Answer: chief_executive_officer