With Kim Jong Il suddenly remaking himself into a friend of the West and with leaders from Libya to Iran whispering hints of moderation, what's left to fear? Plenty, according to Washington think tanks and Pentagon planners who specialize in looking for the next threat. Among the biggest worries are terrorism, Iraq, the continuing threat from Russian and Chinese nuclear arsenals, and ongoing conflicts with small but hard-to-hit "sub-state" groups such as the narcotics traffickers currently working the U.S.-Mexican border.
And new threats are emerging every day. In 1998, for instance, India and Pakistan joined the nuclear armed club—which was worrying...