United States military beret flash

In the United States (US) military, a beret flash is a shield-shaped embroidered cloth that is typically 2.25 in (5.72 cm) tall and 1.875 in (4.76 cm) wide with a semi–circular base that is attached to a stiffener backing of a military beret. These flashes—a British English word for a colorful cloth patch attached to military headgear made popular in US military lexicon by Lieutenant General William P. Yarborough (Ret.)—are worn over the left eye with the excess cloth of the beret shaped, folded, and pulled over the right ear giving it a distinctive appearance.

Source: Wikipedia — United States military beret flash (CC BY-SA 4.0)