Berets of the United States Army
Since November 28, 2001, the black beret is worn by all United States Army troops unless the soldier is approved to wear a different distinctive beret. In the U.S. Army there are three approved distinctive berets.
The maroon beret has been adopted as official headdress by the Airborne forces as a symbol of their unique capabilities, the tan beret by the 75th Ranger Regiment, and the green beret by the Special Forces.
In the United States military, the beret was unofficially worn by a variety of special operations units during and following World War II. In the spring of 1951, the 10th and 11th Ranger Companies wore black berets during their training at Camp Carson, Colorado before their deployment to Japan.
In 1973, permission was granted to local commanders to encourage distinctive, morale-enhancing uniform items and the black beret was adopted by Armor and Armored Cavalry units in the United States.
A black beret was authorized for wear by female soldiers in 1975.
On January 30, 1975 it was officially assigned as part of the newly created battalions of United States Army Rangers who had worn it unofficially during the Vietnam War.
In 1979 the Army Chief of Staff ruled that the black beret was restricted to just Ranger and Airborne units (the latter receiving their distinctive maroon berets on November 28, 1980). However, since November 28, 2001 the black beret is worn by all United States Army troops unless the soldier is approved to wear a different distinctive beret.
Maroon (Airborne) 
In 1943 General Frederick Browning, commander of the British First Airborne Corps, granted a battalion of the US Army's 509th Parachute Infantry Regiment honorary membership in the British Parachute Regiment and authorized them to wear British-style maroon berets. US Army advisers to Vietnamese airborne forces wore the Vietnamese French-style red beret during the Vietnam War.
Headquarters, Department of the Army (HQDA) policy from 1973 through 1979 permitted local commanders to encourage morale-enhancing distinctions. Airborne forces chose to wear the maroon international parachute beret as a mark of distinction. This permission was rescinded in 1979 when the army introduced a policy of standardized headgear and designated wear of the black beret for Ranger and Airborne units. On 28 November 1980 permission was given for airborne organizations to resume wearing the maroon beret.
Tan (Ranger) 
An olive drab beret was worn by Alaska's 172nd Infantry Brigade from 1973 to 1979; the 1st Battalion, 60th Infantry wore theirs with a light blue flash. On June 14, 2001 the U.S. Army Rangers assigned to the 75th Ranger Regiment were authorized to wear a distinctive tan beret to replace the black berets that had become the army-wide standard. The tan beret is a homage to the original buckskin berets worn by Rogers' Rangers during the French and Indian War (1755–1763).
Green (Special Forces) 
In the U.S. armed forces, the green beret may be worn only by soldiers awarded the Special Forces Tab, signifying they have been qualified as Special Forces (SF) soldiers. Special Forces wear it because of a shared tradition which goes back to the British Commandos of World War II. Although it is unusual for American units to wear distinctive headgear, it is the norm in the British Army, where most regiments wear headdress which reflects regimental history. The Special Forces beret is officially designated "beret, man's, wool, rifle green, army shade 297."
The U.S. Army Special Forces wear the green beret because of their link to the British Commandos of World War II. The first Ranger unit, commonly known as Darby's Rangers, was formed in Northern Ireland during the summer of 1942. On completion of training at the Commando Training Depot at Achnacarry Castle in Scotland, those Rangers had the right to wear the British Commando green beret, but it was not part of the regulation uniform at the time and was disallowed by the U.S. Army.
The 10th Special Forces Group (Airborne) had many veterans of World War II and Korea in their ranks when it was formed in 1952. They began to unofficially wear a variety of berets while training, some favoring the red or maroon airborne beret, the black Ranger beret, or the green commando beret. The commandos eventually began to work on a standard uniform that would mark them as unique but still show a smart and professional look. In 1953, after extensive research, a beret whose design was based on that of the Canadian Army pattern, and which was rifle-green in colour, was chosen.
Their new headgear was first worn at a retirement parade at Fort Bragg on 12 June 1955 for Lieutenant General Joseph P. Cleland, the now-former commander of the XVIII Airborne Corps. Onlookers thought that the commandos were a foreign delegation from NATO.
In 1956 General Paul D. Adams, the post commander at Fort Bragg, banned its wear, even though it was worn on the sly when deployed overseas. This was reversed on 25 September 1961 by Department of the Army Message 578636, which designated the green beret as the exclusive headgear of the Army Special Forces.
When visiting the Special Forces at Fort Bragg on 12 October 1961, President John F. Kennedy asked Brigadier General William P. Yarborough to make sure that the men under his command wore green berets for the visit. Later that day, Kennedy sent a memorandum which included the line: "I am sure that the green beret will be a mark of distinction in the trying times ahead." By America's entry into the Vietnam War, the green beret had become a symbol of excellence throughout the US Army. On 11 April 1962 in a White House memorandum to the United States Army, President Kennedy reiterated his view: "The green beret is a symbol of excellence, a badge of courage, a mark of distinction in the fight for freedom." Previously, both Yarborough and Edson Raff had petitioned the Pentagon to allow wearing of the green beret, to no avail.
- "ACU changes make Velcro optional, patrol cap default headgear". U.S. Army www.army.mil. Retrieved 13 June 2011.
- p.223 Stanton, Shelby U.S. Army Uniforms of the Cold War 1948-1973 1994 Stackpole Books
- Army Black Beret: A Short History of the Use of Berets in the U.S. Army