7. Delta Force (USA)
Officially named 1st Special Forces Operational Detachment-Delta, Delta Force was found in the 70’s in large response to growing terror threats. Members are usually recruited from other Forces such as the Green Berets, Marines, and Rangers. Delta members are considered the best of the best. Training is very vigorous and less than 20% make the cut, with intensive courses in everything from marksmanship to espionage.