The Canadians. Next on my list is to add the letters CA to the right of the NATO symbol, rotated 90 degrees. The color will be yellow. I will do the same for all the Commonwealth member nations: NZ, AU, IN, SA, and UK.
I had to choose between two conflicting standards here: (1) white print units get white interiors and (2) Canadians get yellow interiors. I went with the white interiors and I am adding the letters to compensate for the linformation that is lost by not using yellow.
My opinion : I don't like it.
I prefer the Canadians with their yellow box, included the white print units.
They stand out perfectly from the other CW units being Yellow.
Edit : There are lots of countries that have a non standard inside box color, and all white print units for those countries keep their non standard color because it is more important to have the small army of a country looks the same (to better recognize them) rather than have the white prints be white. Czechoslovakia, All CW countries except UK, Chinese Communists, Poland (interior is white for all anyway), Sweden, Greece.
Edit 2 : Please consider leaving those minors' elite unit with their untouched box color, and add a golden star on all elite unit so that they all uniformely stand out from the rest.