Ok, Here's what I've come to decide: (thanks to all your excellent points)
Well, in my opinion the Cold war is named so because it for the most part stayed "cold", This is why I don't think shooting incidents should be included in this GB because none really happened directly between NATO and WarPac countries. As for the Liberty, I don't think she would qualify for this GB, unless modelled before she was attacked by the Israeli's. (as suggested by Imperator-Rex)
Pertaining to the WWII equipment being allowed/disallowed I have decided that WWII vintage equipment does qualify for this GB seeing as even though it wasn't designed for the cold war it would have definently fought and served with the countries if a war did break out.
As for separate incidents involving NATO/WarPac countries (such as J-mart's destroyer in the Cuban missile crisis) I believe as long as no shots were fired during the event then it will be allowed.
Everyone who posted their entries I will be adding them to the list momentarily.
Townsy,
"The object of war is not to die for your country, but to make the other bastard die for his."-- General George S. Patton