In The Last Thirty Seconds: A Brief History of the Evolution of Hit-to-Kill Technology, David K. Stumpf details the development of one of many possible solutions for ballistic missile defense commonly known as hit-to-kill. Hit-to-kill is a nonnuclear technique using kinetic energy, rather than explosives, to destroy reentry vehicles carrying chemical, biological, or nuclear warheads. It is the centerpiece of the United States' current ballistic missile defense systems and has proven invaluable in the conflict between Ukraine and Russia as well as in the ongoing conflict with the Houthi rebels in the Red Sea. While much of the subject remains classified, this detailed study will be welcomed for its substantial references and the inclusion of newly declassified material.