According to wikipedia the US stockpile of Mark 48s is over 1000, and the current manufacturer is building about 50 a year, which certainly seems like enough fo

According to wikipedia the US stockpile of Mark 48s is over 1000, and the current manufacturer is building about 50 a year, which certainly seems like enough for a little bit. Most military manufacturing happens in country or in an allied country, and there are people in the military devoted to making sure the supply chain for this stuff is healthy, and making sure there is room for surge if needed. As for overseas needs, it's hard to imagine a scenario where the US Navy is unable to defend American convoys in the Atlantic (linking them to manufacturing and raw materials in South America, Europe and Africa) at least not in the first year of the conflict. Of course in a total war scenario things start to change. When it's truly nation against nation in a global conflict every part of society needs to be re-tooled into a giant war machine. In WW2 the US told General Motors how many cars they were allowed to make a week, because they needed steel for tanks. I imagine any facility capable of making electronics in the US and Europe today would be re-tooled to make the chips for Mark 48s, AIM-120s, SM-2s, etc. EDIT: Oh, and in a total war scenario, submarines are essential weapons. Remember, a total war isn't just army against army, it's also economy against economy. If you can deny your opponent access to the resources it needs you can win the conflict, and that means you need submarines to sink enemy supply convoys. This would certainly come up in a hypothetical Sino-American conflict. The overwhelming majority of Chinese imports and exports come through ports. The port of Shanghai alone gets more tonnage of supplies in and out in a month than all land routes in and out of China COMBINED get in a year.