USMC Camo pattern

Good photo references. remember if the unit was landing on an atoll or island chain mostly coral/sand, the "brown side" of the  helmet cover and shelter half would be showing. Green side out for larger less tropical targets, i.e Saipan,Okinawa. The camo utilities were short lived in the Pacific due to the heat and humidity. Almost everyone reverted back to the sage green herringbone twills. Semper Fi

Also a good idea to scour the photo archives for the time and place you want to reperesent.  Not terribly uncommon to see mis-matched camo.  Helmets, from the photos seldom seem to have been reversed as universally as the rest of the colors.

Also, "doctrine" said to match camo to conditions, so if a beach was less green, the order of the day would be brown out.  If the interior was more jungle, then the green was to be out.

The practice of towing utilities in net bags while at sea on the way "over there" so that they'd look more "salty" did not help longevity any, either.  So the "rule" seems to have been you wore what you had that fit, first.  Or until someone higher up mandated a more uniform appearance.

I remember one of my trips to the Marine Corps rifle range at Camp Lejeune.  Lots of the Marines sent their woodland style camo through the washer a number of times w/plenty of bleach.  Brand new looking uniforms completely faded out.  Made them look like oldtimers I guess.  I heard that they put out an order not to bleach them anymore.