[20220405]IF11681_防务基础：陆基战略威慑力量（GBSD） .pdf

https:/crsreports.congress.gov Updated April 5, 2022Defense Primer: Ground Based Strategic Deterrent (GBSD) Figure 1. Notional GBSD Launch Source: https:/ The Ground Based Strategic Deterrent (GBSD)recently designated the LGM-35A Sentinel missileis expected to replace the Minuteman III (MMIII) Intercontinental Ballistic Missile (ICBM) in the U.S. nuclear force structure. MMIII has served as the ground-based leg of the U.S. nuclear triadland-based ballistic missiles, submarine-launched ballistic missiles, and nuclear-capable bomberssince 1970. (For details, see CRS Report RL33640, U.S. Strategic Nuclear Forces: Background, Developments, and Issues, by Amy F. Woolf.) The Air Force expects the Sentinel (GBSD) to begin replacing MMIII in 2029. Although some in Congress and outside government have debated whether to continue the program, the Biden Administration has included $3.6 billion for the GBSD program in its FY2023 budget request and is expected to endorse the program in its Nuclear Posture Review. What Is an ICBM? The United States began deploying nuclear-armed intercontinental ballistic missiles in 1959, and has maintained these systems “on alert,” able to launch promptly sinc