[seeker41]

Mabe it was an older non-heat seeking missle. Here'a link with lots of missle stuff I found http://www.designation-systems.net/usmilav/whatsnew.html

[Axenolith]

That is a WAY cool link. I'd doubt its a missile that was unguided because unless we have a bunch of hideously old ones, ours have all been guided some way or another for 40+ years.

Now, it could be a demon or other minion of Satan, he is prince of the aerial host for now and that thing does look kinda ectoplasmic...