Ok, one more Supreme Commander fap.
Many RTSes use factional differences with equivalent, but not identical, units to portray each faction's personal flavour. Supcom does this better than any RTS afaik, by the fact that its more complex unit designs allow for more variables, that it's close enough to reality that the units are self-evident as to what they are, but sci-fi enough that it can go for more exotic faction ideas than ''america vs russia''. Also bolstered by basic, but consistent shape theory and colour symbolism, as well as the aforementioned names.
Let me use the battleships as an example again, but what I'm about to say applies across the board.
The UEF's Summit Class - its strong square shape, vast blue colour, and gameplay properties of slow turning speed, high durability, long range, and armaments most closely resembling a traditional battleship portray the factions stubborn insistence on the old ways and desire for unshakeable, all-encompassing unity.
The Cybran's Galaxy Class - its jagged angular shape, blood-red colour, and gameplay properties of (relatively) quick production, high mobility, weak armour, and quick-firing, jack of all trades, master of none armaments portray the faction's squirrely paranoia and low fighting experience (their leader is a scientist who reluctantly took up leadership).
The Aeon's Omen Class - its clean rounded shape, healing green colour, and gameplay properties of high accuracy, high damage, and simple armaments unmarred by supplementary weapons like torpedoes or AA portray the faction's fanatical assuredness in their ways, which are new to humanity and as the results show, may just be superior to the status quo.
It also fits the general culture of each faction, i.e. the shape of things to come if they win. If the UEF wins, you'll be munching space apple pie and selling anti-matter and anti-matter accessories. If the Aeon wins, you'll live a simple and healthy, but obedient and mindless life. If the Cybrans win, you won't live at all. They just want you off of their territory, your choices are fuck off or die. (It is implied that cybran civillians live in cramped chink hives, but considering their biology that may work for them more than it'd work for us).
Again, you can tell that these are battleships, you know what a battleship is supposed to do, but the specifics of each one get you to think that it's a battleship of such and such origin.