This is not a guess according to this website:
I was recently taking a business group around the beaches of the Normandy Invasion and I was explaining the different code names for each of the beaches: Utah, Omaha, Gold, Juno and Sword. There i…
d-daybattletours.co.uk
As seen from the German point of view the sub sectors are green, white and red, left to right.
As seen from the Allies view approaching the beaches it is red, white and green, left to right.
A ship's lights are red, port or left side, green starboard or right, with a white light
indicating the centre of the ship.