... Would a Marine wearing standard MCCUU (Woodland in this case) under a plate carrier (such as, saaay... a CIRAS!) be wearing the collar up (to protect the neck from chaffing against the straps, etc) or collar down (for comfort/breathability, etc). Would it just be a matter of personal preference? Google Images wasn't my friend today...

Also, is the wearing of shemaghs around the neck common? I have one, as well as a stretchy-knit neck gaiter, bandana, do-rag, multi-purpose kinda thing in Coyote Brown.
Just wonderin'. I'm guessing that some of you with vast photo archives (Conker?) would have some idea of what's common. Thanks for any response.