n the United States Armed Forces, the ranks of warrant officer (grade W‑1) and chief warrant officer (grades CW-2 to CW‑5)—NATO: WO1–CWO5—are rated as officers above all non-commissioned officers, candidates, cadets, and midshipmen, but subordinate to the lowest officer grade of O‑1 (NATO: OF‑1).[1][2][3] This application differs from the Commonwealth of Nations and other militaries, where warrant officers are the most senior of the other ranks (NATO: OR‑8 and OR‑9), equivalent to the U.S. Armed Forces grades of E‑8 and E‑9.