Fairly broad question. The answer would be complete speculation anyways. I would guess they felt like having long hair. If they didn't feel that way I guess they would cut it. Ofcourse there simply could have just been a shortage or scissors.
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They wanted to protest being drafted to a war they did not want to got to and according to them an unjust war. Since the United States army then and now does not allow soilders to grow their hair long.
Ho Chi Minh
Indiana lost over 1,500 men in the Vietnam War.
some men wear hat because they are bold!
Michigan lost approximately 2,654 men in Vietnam.