What is the relationship between airman and Air Force 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.

In addition, last month, a senior airman attended the White House's gay-pride celebration - in the uniform of his preferred gender, which is a departure from current Air Force policy, groups said.

Answer: employer