Background Trimming (Oval) Description
An oval-shaped embroidered item edged with a 1/8 inch (.32cm) yellow border, the overall dimensions 1 3/8 inch (3.49cm) in height and 2 1/4 inches (5.72cm) in width consisting of three equal horizontal stripes, scarlet over white over ultramarine blue.

History
The background trimming was approved 18 May 1987.

Source: The US Army Institute of Heraldry