n. Abbr. WO
A military officer, usually a skilled technician or a helicopter pilot, intermediate in rank between a noncommissioned officer and a commissioned officer, having authority by virtue of a warrant.
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Egyptian Army — Insignia Active Country … Wikipedia
Warrant Officer (United States) — In the United States military, a Warrant Officer (grade W 1 to W 5) is ranked as an officer above the senior most enlisted ranks, as well as officer cadets and candidates, but below the officer grade of O 1 ( NATO: OF 1 ). Warrant officers are… … Wikipedia