Green beret
U.S. Special Forces wear the green beret as a distinction of excellence and uniqueness within the Army.
Military beret
The beret was first introduced in the Portuguese Armed Forces in 1956, when the Air Force Paratroopers adopted the green beret. The Portuguese Army adopted the brown beret for its "Caçadores Especiais" special forces in 1960, generalizing its wear to all units in 1962.