Army Staff Identification Badge

General Douglas McArthur proposed the Army General Staff in 1931, but it was not authorized until 1933. Although the look remains the same today, the name was changed in 1982 to the Army Staff Identification Badge.

It is awarded to officers and enlisted personnel (in a paygrade of E-9) who serve for one year as a member of the Army General Staff.

Source:
http://en.wikipedia.org/wiki/Army_Staff_Identification_Badge
http://www.tioh.hqda.pentagon.mil/badges/ArmyStaffIDBadge.htm