Abstract
This paper (the second of two Parts) continues the historical case study of the evolution of Fleet Ballistic Missile guidance and navigation technologies by tracing the origins and development of the Trident system. This comprises a new submarine and two different missiles, Trident I (C4) and Trident II (D5), the latter of which is considered to be optimized for the destruction of `hardened' targets such as missile silos and command posts. It thus appears to mark a significant shift from the ultimate retaliatory `counter-city' deterrent (which was the main perceived role of Polaris).

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