Delta Force, arguably the 'Special Force' of the U.S., never being confirmed by the U.S. Government, nor denied, is shredded in lots of secrecy. Undeniably, they do exist and even their physical selection process is barely known to the public. Charlie Beckwith, the founder of Delta Force and first commander of the unit, wrote a book, where the initial physical requirements were listed from back in the starting days. There is no guarantee that those are still prevalent to this day.
Motto: "De Oppresso Liber"
Established in: 1977
The applicant has to be a United States Citizen, perform at top efficiency at their Military Occupation Specialty, and have no limiting
physical profile. Charlie Beckwith, back then, wanted well-read soldiers, loners, guys that can act independently and "who have just
half an ounce of paranoia".