From talking with numberous WW II and some Korea Marine vets, some cans were painted in the "X" portion with red or white. The red indicated gasoline, the white indicated water. I have a USMC mystery can that was stenciled gasoline in yellow above the "X" portion, water stenciled in white below the gasoline stencil and also has white painted in the "X" portion. I am sure the can was rinsed out well prior to filling with water, yeah right. This mystery can also has a 4 th Divy TAC marking on it, with the quarter circle and 200 within the quarter circle. It is displayed on my USMC ambulance jeep, even though my ambjeep was assigned to the 5 th Divy on Iwo.
There is a photo someplace that shows a tank crew per se on Iwo with the same 4 th Divy TAC marking and number within the TAC marking and I believe water stenciled on it in the foreground near the tank. There may have been more than one can in the photo. I believe the Tank had wood attached to the side of it and a name and number on the wood.