If you're going to count GTVA destroyers you have to count all of the ones in briefings, as well as all of the NTF destroyers as well as they were commissioned GTVA but deserted. So that should bring the total up to near 30, plus the assumption (a safe one) that you really don't see much of what's going on in the grand scheme of things. You're attached to the Aquitane, so you're naturally going to spend more time in missions involving it. But if you want to go into naming, there is the Aquitane, Carthage, Psamtic, Memphis, Nereid, Bastion, Messana, Phoenicia, etc, plus the Repulse and all of the other Orions you destroy of the NTF; the destroyers in the cutscenes, the Vasudan destroyer that can be seen blowing up in the background of the end game cutscene, etc. There are lots more than 10 destroyers mentioned in the campaign, and many more implied. The 60 figure sounds fine. I do have a problem with a cruiser/corvette/frigate ratio to the destroyers though, you'd expect the fleet to have a good number of smaller support craft to the larger destroyers.