Final answer:
Members of the US Army Special Forces, known as the Green Berets, wear green helmets as part of their military dress uniform.
Step-by-step explanation:
Members of the US Army Special Forces, also known as the Green Berets, wear green helmets. The Green Berets are elite commandos who carry out special missions, and their distinctive green headgear is part of their military dress uniform. The Green Berets were established by President John F. Kennedy to perform specialized tasks and reduce the need for larger military units in combat.