It was discovered in the Vietnam War that Indian trackers used by the US army became non-functional when they were given the regulation hair cut by the US military. Eventually they recruited more trackers and let these guys keep their hair and beards. These trackers who kept their hair and beards were functional as trackers for the US army.
The history of these events is given in this website:
http://www.sott.net/article/234783-The-Truth-About-Hair-and-Why-Indians-Would-Keep-Their-Hair-Long
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