Description
A rectangle arched at the top and bottom 3 inches (7.32 cm) in height and 2 inches (5.08 cm) in width overall divided per bend a bend counterchanged Or and Azure, overall a lightning bolt Gules fimbriated of the first; all within a white 1/8 inch (.32 cm) border.
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Symbolism
Yellow is the traditional color for Armor and Cavalry and blue is associated with the Infantry. Red is for Artillery and Engineers. The thunderbolt symbolizes speed and power. White is adapted from the California State flag. The division of the device with the bend alludes to the meeting of land and sea; California and its shoreline.

Background
The shoulder sleeve insignia was approved on 2 February 2010. (TIOH Dwg. No. A-1-1022)