It holds it shape, has a base which is very strong, and also has a strong support. It is strong because the three legs of a triangle define one and only one triangle.

Soldiers are put through some of the most mentally challenging and physically demanding training in the world. It is designed to find and develop humans of the strongest character who give everything they have to accomplish their mission and support the humans on their team. Eventually soldiers have the ability to perform in stressful and often uncomfortable environments on sea, air and land.

Astronauts simulate space training by diving underwater in a Neutral Buoyancy Pool, surviving in extreme conditions from all the elements, and tolerate acceleration above Earth's gravity. They typically spend hours training in simulators for every minute they fly in space so they are familiar with planned activities and can react quickly to unusual events. They rehearse their own decisions, as well as learn the teamwork vital to successfully overcoming a hurdle.