How do you change a normal tank into a marine tank?

During the Vietnam War the standard US Army M48A3 90mm gun Patton tank utilized white lettering. US Marine Corps M48s used yellow lettering. Example: the US Army tank would have "US Army then its serial number" in white letters stenciled across its sponson boxes, while the US Marine tank would have, "USMC" in yellow stenciled across its boxes.

Note: The sponson boxes were constructed of sheet metal and welded/bolted to the sides of the tank on each side on the fender; they held tools, etc.