I have often said that I feel many campaigns under-rate the effectiveness of military forced versus superheros. True, this matches most comics, but...
I thought this was an impressive video... 3 times the impact energy of a 120mm smootbore, guided...
http://www.strategypage.com/gallery/default.asp?target=20030213.htm
I don't think, however, that getting a superhero team involved in full scale war is usually a good thing. WWII level, sure. Alien invasion, sure. Run of the mill miliatry conflict, they would be more likely to try to head it off if possible.
Maybe they would go in on their own to find out whether he "really" has wmd, and take them out if they exist...