Green beret
The green beret was the official headdress of the British Commandos, a special-forces unit active during World War II. It is still worn by members of the Royal Marines after passing the Commando Course, and personnel from other units of the Royal Navy, Army and RAF who serve within UK Commando Force and who have passed the All Arms Commando Course. There are certain other military organizations that also wear the green beret because they have regimental or unit histories that have a connection with the British Commandos.