[xzins]

If is not a combat impediment or a hygiene concern, then leave the troops alone. If it is an appearance concern, that is, it makes the individual soldier look less than well-regulated and a detriment to good order and discipline, then that would be an extreme appearance that would not fit both naturally and neatly beneath any of the military’s head coverings.

[Iron Munro]

"If is not a combat impediment or a hygiene concern"

Unwashed hair stinks.

Corn rows and dreadlocks are difficult to keep clean in the best of circumstances.