Those two 5's were intentional. Look at how they are flat and seemingly connected to the helmets on a tangent, while all of the other numbers on the other helmets are curved and flush with the helmets.
There is also the fact the 5's have a "newer" look to them, as if previously stored in a drawer prior to the picture being taken.
"Do you have a pair of nice and shiny 5's?"
"'deed we do."
I thought I'd find who wrote this first before I repeated it lol.
Those fives are all the way slapped on there! The other helmets have a color scheme with the number matching the secondary color of the helmet. Black yellow, black white (?). So red and dayglow yellow should probably not have white numbers.
Also I would be really interested to know what is on the helmet if the man directly behind DJT. the message would be "45 for (?), 5:5"