Topic - Delta Force

1st Special Forces Operational Detachment-Delta (1st SFOD-D) is one of the United States' secretive Tier One counter-terrorism and Special Mission Units. Commonly known as Delta, or Delta Force, it was formed under the designation 1st SFOD-D, and is officially referred to by the Department of Defense as Combat Applications Group. This unit is an elite Special Operations Force, and an Army Compartmented Element of the Joint Special Operations Command. Delta Force, along with its Navy counterpart DEVGRU, are the United States' primary counter-terrorism units. - Source: Wikipedia