The spirit of fire is only a medical ship and yet it's twice the size of the ordinary Figates, it's also a differnt shape.
The cannon on a frigate is not a M.A.C. The M.A.C has 5 barrels next to each other and can fire only at ground targets (or anything under it).
The game should have Johnson in it as a "hero" charcter, sadly, theres no Master Chief but there are 50 other spartans of group omega which i suppose makes up for it.
This game looks awesome and it might even give C&C a run for it's money.