The United States Army Special Forces, colloquially known as the "Green Berets" due to their distinctive service headgear, is a branch of the United States Army Special Operations Command.
Special Forces soldiers from Task Force Dagger and Commander Dostum on horseback in the Dari-a-Souf Valley, Afghanistan, c. October 2001.
ODA 525 team picture taken shortly before infiltration in Iraq, February 1991
Soldiers from each of the Army's seven Special Forces Groups (beret patches, l. to r., of 1st, 5th, 7th, 10th, 19th, 20th and 3rd SFG) at the gravesite of President John F. Kennedy in November 2011.
An MH-60L from 160th SOAR deploys an ODA from 7th SFG(A) on board a U.S. submarine for a joint exercise
Delta Force
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The 1st Special Forces Operational Detachment–Delta, also known as Delta Force, Combat Applications Group, or within Joint Special Operations Command as Task Force Green, is a special operations force
Delta Force's founder Charles Beckwith in 1980
Delta Force bodyguards in civilian clothing providing close protection to General Norman Schwarzkopf during the Gulf War, 1991
Delta C Squadron, Mogadishu, Somalia, September 1993
An example of the "Code of the Special Forces Operator", dated 1959. This example pre-dates Delta.