United Kingdom Special Forces.

Highest; starting from top.
To lowest; to the bottom.

Red Beret's: Royal Officers
White Beret's: Infantry Officers
Green Beret's: War Specialists
Orange Beret's: Non-active Officers
Khaki Beret's: Beginning Officers
Blue Beret's: First Classes

[ If you are a Special Forces you must wear all white and then color of Beret. ]