Description
On a red square 2 inches (5.08cm) on a side, a white four-leaf clover with stem, 1 3/8 inches (3.49cm) across leaves, stem to bottom - the square to be worn point up.

Symbolism
The composition of this design alludes to the numerical designation of the organization and the colors are those associated with "armies."

Background
The shoulder sleeve insignia was originally approved for Fourth Army on 26 January 1927. The insignia was redesignated for Fourth United States Army on 4 October 1957. (TIOH Drawing Number A-1-4)