Nuclear weapons always leave radiation. Theres just acceptable limits people are trying to achieve.
And if you guys want to know what a nuclear weapon with a decent {20 megatons} yield would do, go watch Terminator 2, and look for the nightmare Sarah Connor has. A 10 megaton explosion would be about Hiroshima, and Tac-nukes generally keep it under one megaton.
Lethe:
Then you should be pretty happy with the game; it's a lot of fun.
Even if a squad of marines out of dozens of units on a battle field has shoulder pads .25" too thick for a fanboy's tastes :)
Inspires confidence, no?