[Raellus]

I haven't even checked a map yet but HorseSoldier's outline of Soviet operational objectives and manouvers sounds very convincing.

I also like Web's suggestion that the U.S. decides to use Alaska as a quagmire of sorts into which the Soviets are encouraged to waste their strength. One could bottle of the Soviets indefinitely with minimal investments in military manpower and material. Canon seems to back this up. Then there's the Canadian military. As Web pointed out, this scenario only makes sense if Alaskan oil is no longer available to either side (likely due to a good nuking).