Warrant Officer
WARRANT OFFICER
Warrant Officers are the technical experts in the Army. They have specific technical or tactical specialties (e.g., helicopter pilots), and manage and maintain many of the Army’s combat systems, vehicles and networks. Once they reach the rank of Chief Warrant Officer Two (CW2), the President of the United States gives them the same status as a Commissioned Officer.
CHIEF WARRANT OFFICER 2
CHIEF WARRANT OFFICER 2 (CW2)
Chief Warrant Officers become commissioned officers as provided by the President of the United States. CW2s are intermediate level technical and tactical experts who perform increased duties and responsibilities at the detachment through battalion levels.
Source
http://www.army.mil/symbols/warrantdescription.html