John Leadmon, retired director of submarine design and systems engineering for Naval Sea Systems Command (from 1995-2007), speaks about the history and the future of submarine design as part of the Rear Adm. David W. Taylor Naval Architecture Lecture Series at Naval Surface Warfare Center, Carderock Division in West Bethesda, Md., on March 8, 2018. ( Navy photo by Jake Cirksena/Released)

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Keywords: architecture, carderock, design, engineering, knowledge, learned, lessons, management, naval, navsea, submarine