In this exploration of the mathematical equations and logic behind antiballistic missiles (ATBMs), the author examines theatre missile defence as well as warhead design and concepts for ATBMs. The book demonstrates the system aspects needed as a systems warhead engineer designing complex tactical and defence warheads under tight budgetary constraints. The text features an investigation of energy, momentum and methods for estimating damage on very complex ballistic missile payloads, such as submunitions of chemical and biological nature. Direct hit, missile debris and fragmentation are discussed. High strain rate, explosives, thermodynamics, heat transfer, chemistry, penetration mechanics, statistics, dynamics and finite element equations are also covered.