oh, the attack on the USS Cole? The Attack on the American Embassy in Africa? 9/11? Those did not happen, our Nuclear Deterred stopped them!!! (oh yes, their didn't).
Lets get serious, we have over 4000 Nuclear bombs. Who will launch a first strike so we will have to nuke them? England? The European Union? Russia? China? India? Japan? Israel?
Notice I ignore Iraq and Iran, Iraq i presently under US occupation but neither country ever had the capability to launch an attack on the US. The same with the rest of the World (The biggest exceptions I listed above). Will we Nuke any of them in a war where they are on the other side in WWIII? The answer becomes a quick NO, we gain no advantages and lose no advantages by using Nuclear weapons. Realistically we have to look at who we will be fighting? Except for the above countries, no one Else in the world has the capability (or potential capability) of launching a Nuclear attack. Thus except for the above countries Nuclear weapons are useless, unless your intention is to kill every body in that country.
Now, if you read Mahan and his paper on Sea Power, you will see he advocated Sea Power over land power, for sea power could move by sea and outflank any land based army. His paper advocated this approach. The biggest problem with it was what about Russia and Central Asia? Basically Mahan ignored them for that represented a part of the world where his views did not work do to the distance from the coast. After WWII and the start of the Cold War his view was embraced by the US Air Force is a radical way, advocated air power to control the seaways, and to destroy that area of the world where sea power could NOT be brought to bear (i.e. Russian and Central Asia). This doctrine took on a life of its own in the US Air Force, shocking both the US Navy and the Royal Air Force when both were exposed to it for the first time in the 1950s (The exposure to the RAF had the affect of leading indirectly to the Movie, Dr Stranglove, or how I quite worrying and learn to love the bomb".). The sheer stupidity of this doctrine has been shown over and over again since the 1950s, but it survives.
Now an alternative theory, one that had been adopted by the US Navy and the RAF in the early 1950s (independently of each other) was to use Atomic Weapons to knock out the Soviet's Ability to support their Army. This is believed to be around 500 bombs (The Chinese seems to have embraced this doctrine, limiting themselves to 500 bombs). The Soviet Union, whose natural paranoid was reinforced by the US Air Force flying fully armed B-52s up to its borders, also adopted the doctrine. Through the Soviet Doctrine was tied in with mixing its ground forces with NATO ground forces quickly so that neither side would dare use Nuclear Weapons for fear of hitting their own personnel (Thus the Soviet Union adopted a non-first strike option, through the US always down play this doctrine while saying NATO'S doctrine was to use Nuclear weapons FIRST against any Soviet ground force attack).
As one historical of the period said (after observing the fact that American Politicians were quicker to opt for Nuclear Weapons then were the Military in war games of the time period), NATO doctrine was to "fight like hell for three days then blow up the World". The Soviet Union Doctrine after the death of Stalin, seems to have been to maintain a force in Europe so to be able to engage American Forces quickly in a time of war to minimize the chance of NATO using Nuclear weapons (The Soviet Union had the Capability to drive to the Atlantic Ocean from the Iron Curtain in a one week period, in fact the Soviet Union did a War game about 1985, where Soviet Forces roughly equal to the Soviet Army in Europe the same distance from Berlin to Lisbon in a one week period. Whether such a plan would have worked against NATO is debatable, but it show the power of the Soviet Union just before its collapsed. Would Nuclear weapons changed anything in Europe? According to NATO plans I have read about, NO, the Soviet Forces always had an edge no matter how much NATO increased the ante (this is also the chief reason the Soviet Union Collapses, you can NOT spend 40% of your GDP on Defense for any length of time, you will bankrupt the country doing so, as did the Soviet Union).
I go into the above several times over the last 30 years and I have come to a conclusion. The Soviet Union was doomed from the fall of Kruschev onward. No one in its leadership was willing to cut back on Military Spending (Kruschev seems to have been doing so, emphasis nuclear weapons in place of standing armies, but otherwise cutting back military spending). Once Brezhnev was in Charge, the Military was given what it wanted, even at the expense of the rest of the Soviet Union. On the other hand, the Soviet real fear was an attack on Russia. This was their big fear and one reinforced by how the US targeted its bombers and missiles. This could have been achieved with 500 bombs, not the 4000 we have. Why 4000 bombs? While the Air Force looked at what was needed to make sure each target was hit, it decided the only way to be sure was to make sure each Soviet City/Target had at least three bombs allocated to it, in the 1950s by three different bombers, in the 1960s onward each target by a Bomber and at least two missiles (Both the Bombers and missiles had multiple bombs, so while each bomber/missiles had three or more cities on its bombing list, each city/target had at least three bombers or Missiles assigned to hit it. Furthermore to make sure these target were hit, secondary target had to be hit so minimized antiaircraft fire and missiles from hitting the bombers and missiles. Furthermore more and more targets had to be hit so the attack could be "successful" pretty soon 98% of the population of Russia had at least one nuclear device aimed at it. The only reason the US stopped at 98% was to get to 99% coverage we needed another 4000 bombs. The worse part the first 500 bombs would do most of the damage, the remaining 3500 bombs were to hit smaller and smaller target.
If you review the above, you quickly see that the US had no intention of ever occupying the Soviet Union, you do NOT destroy what you can take. The plan was to eliminate any threat from Central Asia by destroying it. The Soviet leadership seems to have accepted this policy and adopted a policy of never bring an action that could lead to Nuclear war (The biggest exception was the Cuban Missiles Crisis but that was when the Soviet was still why behind in bombs and missiles, Mutual Assured Destruction, MAD did NOT become the US doctrine till the mid 1960s as the Soviet Union finally caught up with the US in terms of Missiles and Bombs). The biggest problem with MAD was its assumption that you needed 4000 bombs to make it work, even the founder of MAD, McNamara believed you only needed 500.
Sorry, the need to keep 4000 bombs ready for use is NOT worth the investment, we can eliminate all but 500 and retain full retaliatory capability against anyone. Furthermore given the Collapse of the Soviet Union, we could eliminate all of our sea and land based missiles and rely on bombers to launch the bombs. The main advantage of bombers is they take six to 12 hours to hit their targets, which gives us time to reconsider the attack (The 20 minutes needed for a sea based missiles to hit its target is just to short a time period in today's age, we MUST make sure all sides have time to reconsider their attack especially since mist will be launched in "retaliation" not in some sort of preemptive attack. Even if the Russian Republic keeps its 6000 bombs, how will they use them and against whom? Russia is dependent on western furnace as is any other country so the bombs are useless (You do NOT attack someone you need to borrow money from OR sell to). The same with China, as least for the foreseeable future (i.e. next 20 years). China may developer missiles that can hit the US, but why? even if they did we can hit them back with bombers from the US or short range missiles from the Western Pacific. If we lose control over the Pacific that may be a different story, but as long as we control the Pacific, we can fly bombers over it any time we please. 500 missiles based on B-52s, B-1 and B-2 in the US is sufficient enough deterrent. We do NOT need 4000 bombs and delivery systems, lets get rid of them.
One last comment, you plan to fight the next war NOT the last war. We do NOT need 4000 bombs to defeat bin Laden. In fact launching a atomic bomb attack on him would make him a martyr (If we new where he was) AND produce a lot of new recruits for him based on the various civilians we will kill in such an attack. Thus Nuclear weapons are useless in the War Against Terrorism, and in fact counter productive. Given the limitation of any budget, paying for weapons we will never used is a waste of money, especially when we need it elsewhere. Thus we need more money of Special Forces so to find out where bin Laden i, and less on Nuclear Weapons we will never use. They is no one we will fight in the next 20 years (China being the biggest exception) that we need Nuclear Weapons to fight. As to China, keeping 500 bombs back will provide enough of a deterrent. We need an army to fight the war we are facing, one where we need boots on the ground and that means infantry not air power, not nuclear weapons. Thus my comment at the beginning in of this thread, we are in a war with bin Laden, lets set up our military for that war.
Some More on Mahan and his view on Sea Power:
http://en.wikipedia.org/wiki/Alfred_Thayer_Mahan