FIGURE 4-2 Illustration of the reentry vehicles (RVs) proposed for different stages of conventional prompt global strike (CPGS) systems. A previously developed modification to ballistic reentry, E2, is the basis for the proposed short-term Conventional Trident Modification (CTM) option. For the Submarine-Launched Global Strike Missile (SLGSM), a scaled-up version of the previously developed Mk 500 is the proposed RV, which is designed to have a glide range less than 1,000 nmi. The Conventional Strike Missile (CSM)-1 concept builds on theAMaRV vehicle and is considered to have an 800-second glide segment to its trajectory. The CSM-2 concept builds on a high lift-to-drag (L/D) vehicle, which is being developed by the Defense Advanced Research Projects Agency FALCON program, that has a 3,000-second thermal protection system (TPS). NOTE: AMaRV, advanced maneuvering reentry vehicle; E2, Enhanced Effectiveness (one of two test beds for demonstrating proof-of-principle concepts for ballistic missile delivery in CPGS and discussed in Chapter 4 in the subsection entitled “Guidance, Navigation, and Control Accuracy Issues”); LETB, Life Extension Test Bed (the second of two test beds for demonstrating proof-of-principle concepts for ballistic missile delivery in CPGS and discussed in Chapter 4 in the subsection entitled on “Guidance, Navigation, and Control Accuracy Issues”).