Thank for the up vote.

There is also some speculation online, have not found any solid evidence about hair and the role it plays in intuition and the nervous system.

Supposedly, Hair, like skin, is an extension of the nervous system, it may be correctly seen as exteriorized nerves, a type of highly evolved ‘feelers’ or ‘antennae’ that transmit vast amounts of important information to the brainstem, the limbic system, and the neocortex.

Again supposedly during Vietnam some testing was done. So the testing institute recruited more Native American trackers, let them keep their long hair, and tested them in multiple areas. Then they would pair two men together who had received the same scores on all the tests. They would let one man in the pair keep his hair long, and gave the other man a military haircut. Then the two men retook the tests.

Time after time the man with long hair kept making high scores. Time after time, the man with the short hair failed the tests in which he had previously scored high scores.

Here is a standardized test:

The recruit is sleeping out in the woods. An armed ‘enemy’ approaches the sleeping man. The long haired man is awakened out of his sleep by a strong sense of danger and gets away long before the enemy is close, long before any sounds from the approaching enemy are audible.

In another version of this test, the long haired man senses an approach and somehow intuits that the enemy will perform a physical attack. He follows his ‘sixth sense‘ and stays still, pretending to be sleeping, but quickly grabs the attacker and ‘kills’ him as the attacker reaches down to strangle him.

This same man, after having passed these and other tests, then received a military haircut and consistently failed these tests and many other tests that he had previously passed.

So, the document recommended that all Native American trackers be exempt from military haircuts. In fact, it required that trackers keep their hair long.