Impractical and a major FPS killer to. Add those, a few aircraft with some ground objects, then a terrain. You would get about 3 FPS average. I maan its nice to have an immerisive environment. But in a dogfight does it really matter that if you have a towering cumulus clouds too look at? To me, no. And active ground environment is much more desired IMHO. In fact if I want nice clouds, I fire up FSX.
Having said that, some S2S missile would be great but ICBM's not so much. I mean a Minuteman III with 3 1.7 MT Mirvs, would pretty much render the sim...well nuked. All the US ICBM's are in the heartland of the USA. Now MGM-31 Pershing's and or GLCM system would be perfect for this. Even this.
http://en.wikipedia.org/wiki/MGM-134_Midgetman
http://en.wikipedia.org/wiki/GLCM
http://en.wikipedia.org/wiki/Pershing_II
Would make for some oustanding ground objects for the series.