Delta Force, officially known as the 1st Special Forces Operational Detachment-Delta (1st SFOD-D), is a special operations unit of the United States Army. Established in 1977, it specializes in counter-terrorism, direct action, and covert operations. The unit is highly trained in various combat and survival skills, making it one of the most elite military forces in the world. Members of Delta Force are selected from various branches of the military and undergo rigorous training to prepare for diverse missions. The unit often operates in small teams and is known for its secrecy, with many details about its operations remaining classified.