The term BASE OR CASE CLOSER is a job description for a MENT, which is a four-letter word. A BASE OR CASE CLOSER is responsible for closing cases or bases in a variety of settings. This could include closing cases in a court of law, closing cases in a hospital or medical setting, or closing cases in a business setting. The BASE OR CASE CLOSER is responsible for ensuring that all paperwork and documentation is properly completed and filed, and that all necessary steps have been taken to close the case or base.