Actually, that's a good idea - there is such a variety of styles to choose from on that cover. There were not too many Vietnam soldiers until after 1968 when Nixon became President and escalated the war. The thing about the sixties was that there really wan't a norm. The era has a reputation of tie dye and love beads, but it was really "anything goes". Anything that was different, colourful and anti-establishment was perfectly acceptable.
Just a heads up - polyester leisure suits came in the seventies - don't go there

Kathleen