Central Intelligence Agency, National Intelligence Survey 11… (1973)
“ The coast artillery is a special part of the naval forces, contributing much to force effectiveness. Combat terrain requirements have resulted in three principal types of coast artillery units: artillery and missile, mine warfare, and coastal rangers. The artillery and mine warfare units represent integrated components for the direct defense of harbor and sea approaches. Most fixed artillery installations have been blasted out of solid rock in areas surrounding important harbors. Each unit is self-supporting. ”
