Troops began wearing berets as a part of the headgear of military uniforms in some European countries during the 19th century; since the mid-20th century, they have become a component of the uniforms of many armed forces throughout the world. Military berets are usually pushed to the right to free the shoulder that bears the rifle on most soldiers, but the armies of some countries, mostly within Europe, South America, and Asia, have influenced the push to the left (i.e. "French pull").
In many countries, berets have become associated with elite units, who often wear berets in specific colours. For instance, the maroon beret is mostly traditional headgear for airborne forces around the world, with a few exceptions—for example, the Russian Airborne Troops, who wear a sky-blue beret, and the Portuguese Paratroopers who wear a green beret.