Barry E: you can win a thousand tactical battles but ca only lose one nuclear war. the only viable deterrent to a nuclear attack is mutual assured destruction with retaliatory nucs. SLBMs are becoming vulnerable as our Navy shrinks and our enemies' grow. We have fewer and fewer aircraft tha can survive in a nuclear environment. ground based ICBMs are the only ones that ca respond reliably to a surprise attack. Titan II's could get out of the hole in 54 seconds after a confirmed launch order.