Juan Amaro, a maintenance technician with the Program Executive Office Aviation, was promoted to the rank of Chief Warrant Officer 4 during a ceremony Feb. 21 at Redstone Arsenal, Al. Amaro, who serves as a contingency operations officer in the PEO Aviation G3 section, previously served as Platoon Leader for the 1st-230th Assault Helicopter Battalion of the Tennessee Army National Guard, Tullahoma, Tenn.