Sentence:  It was an alien land , and she hated it intensely ; she was already considering putting in rebellious requests for duty at San Diego , Bremerton , the Great Lakes , Pensacola - any place the Navy had a hospital - with a threat to <WSD>resign</WSD> her commission if the request were not granted . 
Meaning of the word marked with <WSD> tags:  leave (a job, post, or position) voluntarily