It would actually not be too bad if you could remove units you've already placed, to place them somewhere else.
Sometimes it happens you misclick (who would want an airfield _on_ London, eh Ice Cream
It should be only allowed before defcon 4, as when radar comes into play and you can make out installations, it shouldn't be the point that the other party can just go about moving them (or those radars!!
Flame me gently










