One of the main objectives for the GDF is usually drive the MCP to the green location. When you enter the MCP, you must follow the green arrows to the end. Failure to follow the arrows will cause the MCP to blow up, and you will start over.
In one of the maps of the North American campaign, a white board is placed in the offices. This white board is a map of Enemy Territory's Oasis, one of the first maps created. In the right hand corner, it says Don't Rub Off.