This report from the Nuclear Fuel Working Group provides some recent numbers on U.S., defense uranium needs, for those who are interested in that sort of thing:
Defense Needs: The U.S. has well-defined defense needs that also depend on a healthy nuclear fuel cycle in the long-term. There are currently two defense needs for uranium: low-enriched uranium is needed to produce tritium required for nuclear weapons, and highly- enriched uranium is used to fuel Navy nuclear reactors. Agreements with foreign suppliers prohibit the use of uranium for military purposes. DOE’s National Nuclear Security Administration is responsible for both these missions, and has sufficient stockpiles of unobligated uranium fuel to support tritium production until 2041 and Navy propulsion until the 2050’s. Ensuring a viable industry mitigates risk to future supply chains.