Description
On a Green shield-shaped embroidered device edged with a 1/8 inch (.32 cm) Yellow border 2 3/8 inches (6.03 cm) in width and 3 1/8 inches (7.94 cm) in height overall blazoned as follows: Vert, a key with a pierced trifoliate bow, ward up and a double-axed fasces saltirewise blades up all Or, overall a sword palewise blade up of the like, pommel Sable charged with a pellet fimbriated Argent (Silver Gray).

Symbolism
Green and yellow are the colors traditionally used by Military Police units. The key indicates command, control and guardianship of the 42d Military Police Brigade. The double-head fasces denote magistrate’s authority and the unit’s combat mission. The sword represents military readiness; the silver gray ring of the black disc symbolizes the brigade’s lineage to I Corps.

Background
The shoulder sleeve insignia was authorized effective 16 October 2004. (TIOH Drawing Number A-1-866)