Description
On a silver gray hexagon, one point up, with a 1/8 inch (.32cm) oriental blue border 3 inches (7.62cm) in height and 2 5/8 inches (6.67cm) in width overall, an oriental blue hexagon bearing a yellow sphinx superimposed by a silver gray dagger hilted black.

Symbolism
Oriental blue and silver gray, representing loyalty and determination, are the colors of the Military Intelligence branch. Yellow/gold symbolizes excellence. The hexagon borders reflect the numerical designation of the unit. The sphinx, a traditional military intelligence symbol, indicates observation, wisdom and discreet silence. The unsheathed dagger reflects the aggressive and protective requirements and the element of physical danger inherent in the mission of the unit.

Background
The shoulder sleeve insignia was originally approved for the 66th Military Intelligence Brigade on 27 August 1987. It was cancelled on 17 July 2002. The insignia was reinstated and redesignated for the 66th Military Intelligence Group with the description and symbolism updated on 18 June 2003. It was redesignated effective 16 July 2009, for the 66th Military Intelligence Brigade. (TIOH Dwg. No. A-1-740)