Posted 17 June 2014 - 06:57 PM
The real life purpose of the Iron Curtain was to make Soviet Eastern Europe more 'impervious' to Western influence, otherwise one doesn't need to bother building kilometres of fences. Should it work as intended, it would be Shielding combat units is probably a wacky idea that WW thought up as a gimmick counterpart to the Chronosphere.
The Phase Tank in RA1 is probably just WW wanting to reuse code used for Nod's stealth tank (and ended up writing more code because Phase Tank using Submarine sounds is weird). There was no story to it other than that the Allies developed an experimental prototype. The concept of stealth was a hot topic throughout the Cold War in a more realistic way - stealth against radar. In RA2/YR the RadarInvisible tag is specially suited to this. Of course, magical stealth stayed because submarines needed it, code-wise.