Living in the West Country I often see many Royal marine vehicles of all types.
Some have a blue/red square with a white number on.
As can be seen on this pic of a defender above the number plate
Does it represent a troop, a section ,an area etc etc
I have seen many different numbers 6, 9, 14 ,1 etc
Is there a definitive specific allocation or what do they represent
I have wondered for years
Thanks in advance for any response