The nuclear arsenal and the counterterrorism enterprise are relatively self-contained demands that require only a relatively modest share of US defense efforts and resources. Over the 2020s, recapitalizing the US nuclear arsenal is expected to consume approximately 5–7 percent of the total defense budget. The United States spends something on the order of 15 percent of the defense budget on the counterterrorism enterprise—a significant fraction, but valuable given the importance of the mission.28
