What is the hardest US special forces to get into?
Army Green Berets — "Special Forces"
Notably, Green Berets have some of the toughest initial training in the entire military (at the risk of drawing the ire of SEALs and Marine Recon). Their initial test lasts an incredible 24 days, and that's just to see if you can attend the Green Beret qualification course. What are the hardest special forces to get into? La Escuela Militar de Lanceros. The Colombian Lancero course is one of the toughest foreign special-operations courses US commandos get to attend.