Background Trimming (Oval) Description
An oval-shaped embroidered item scarlet over white, with a yellow lighting bolt running throughout from upper right to lower left, all edged with a 1/8 inch (.32 cm) light blue border, 1 3/8 inches (3.49 cm) in height and 2 1/4 inches (5.72 cm) in width overall. 

History
The background trimming was approved on 14 November 2005.

Source: The US Army Institute of Heraldry