So far we have small patrol boats, and even a small capital ship, but no destroyers. A ship that could fire missiles and big naval guns from.
Also, here's a small list of cool addons
1. A OICW support weapon. I saw this on Future Fighting machines, and it looked cool. It uses the 20mm grenade from the OICW, takes 2 men to operate, and has a 50 rounds drum mag. It beats the shit out of men and apcs.
2. RIB - Navy uses these Rigid Inflatable Boats to insert seal squads. Usually have a Mk19 gren launcher and some 50 cals for guns. It's fast too.
3. I think it was called the ?Rapier?, but it was a portable SAM launcher with 4 missles on it. Definately a british system. Similar to the Patriot, but much smaller.
4. Speaking of...the Patriot SAM system. This would be a cool addon.
5. SA-XX sam vehicles for the Soviets, like SA-13 gopher, or SA-11. You could use the BRDM chassis for one, with a turret on it for the missiles. Definately 80's vintage there.