Check this pic out here:
Looks like when you add a node with a patrol group you have the options of adding either ELITE patrol craft, destroyer or escort carriers. Below that there are Super Battleships and Super Carriers.
In the pic the patrol craft is added as a normal non elite unit, could have been added as ELITE.
If someone had the time they to go through all the nodes (which will take years) you could have all "Elite" and "Super" units in the game. Couple that with a damage mod and your good to go.