Insignia Description
A Gold color metal and enamel device 1 3/16 inches (3.02cm) in width overall consisting of a hexagon composed of a chequy of (6) Black and White sections (one angle up), surmounted throughout by a smaller hexagon (flat side up) composed of a chequy of nine sections of Gold and Blue (oriental) with the center square charged with a Gold sphinx head, facing to the right, all above a Gold scroll inscribed "HONOR VALOR AND SECURITY" in Blue (Oriental) letters.

Symbolism
The black and white symbolize enlightenment and knowledge both day and night around the world. The chequy represents the unit's tactical and strategic capabilities in counterintelligence. The sphinx is a traditional intelligence symbol and indicates observation, wisdom and discreet silence. The hexagon within a hexagon "6-6" further distinguishes the numerical designation of the organization.

History
The distinctive unit insignia was originally approved for the 66th Military Intelligence Group on 16 July 1969. It was redesignated for the 66th Military Intelligence Brigade on 8 October 1986. The insignia was redesignated effective 16 October 2002, with the description updated, for the 66th Military Intelligence Group.

Source: The US Army Institute of Heraldry