Warrant officer

A warrant officer (WO) is an officer in a military organisation who is designated an officer by a warrant, as distinguished from a commissioned officer who is designated an officer by a commission, and a non-commissioned officer who is designated an officer, often by virtue of seniority. Warrant officers appear most often in media involving military units or branches of an Armed Services group. This also includes fictional military units, such as seen in a great many science fiction features.