Cups have nothing to do with rank,
RED is Left,
GREEN is Right &
BLUE is/was for the F/E, got all a bit mixed up when people confused it with rank which it seems to have developed fully into now that
YELLOW seems to be for the S/Os.
Just bring your own Starbucks hot cup they're much better anyway.
Surprised no one has mentioned the rubbish bag, location and knot tying is a prerequisite prior to cup usage!