You've got to be awfully careful using digitally colorized photos as reference materials. A lot of the colors are subjective and open to artistic interpretations.
The link below takes you to a WW2 era documentary that was shot at Iwo Jima during the battle on color Kodachrome stock, so there was never a need for an artist to color the images. The sand shown in the footage is pretty distinctive. Have a look...
https://youtu.be/Cp-AndrEHow