Beret Flash Description
A red shield-shaped embroidered device with a semi-circular base with a 1/8 inch (.32 cm) red border bearing four evenly spaced yellow horizontal bars 1/8 inch (.32 cm) in width.  The overall dimensions are 2 1/4 inches (5.72cm) in height by 1 7/8 inches (4.76cm) in width overall.

History
The beret flash for the 4th Battalion was approved on 14 March 2006.

Source: The US Army Institute of Heraldry