There is no greater human trained strike force in the World than the United States Navy Seals. They are trained to work as a team in the most severe conditions known to man. Very few of the people who volunteer for training can make it, as the qualification of agility, endurance, perseverance and strength are not common in humans.
The United States Navy Seals Teams are made up of super humans and one cannot merely join the team until they can prove without a doubt that they have what it takes to perform at those super human levels. This is not to say that those who do not make the program are not