Sentence:  A person who is a member of, applies to be a member of, has performed, applies to perform, or has an obligation to perform service in a <WSD>uniformed service</WSD> shall not be denied initial employment, reemployment, retention in employment, promotion, or any benefit of employment by an employer on the basis of that membership... 
Meaning of the word marked with <WSD> tags:  A military organization, or another agency or organization of government in which members wear a uniform.