There are five grades within the Army Warrant Officer Corps. A person is initially appointed as a Warrant Officer (WO1), and progresses to Chief Warrant Officer Two (CW2) after 2 years. Competitive promotion to Chief Warrant Officer Three (CW3), Chief Warrant Officer Four (CW4), and Chief Warrant Officer Five (CW5) occur at approximately six year intervals for Aviation Warrant Officers and five year intervals for those in other branches.