The case rests on practical measures: D-class destroyers ordered with ASDIC, a sizeable submarine service, new sloops, exercises, and experiments with aircraft. The Navy regarded anti-submarine warfare as important, while the RAF did not yet see long-range maritime patrol as its core responsibility. That institutional split explains why Coastal Command remained short of aircraft even as other anti-submarine capabilities developed.
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Why the Royal Navy did not simply neglect anti-submarine warfare
The anti-submarine problem involved separate budgets and priorities, not a Royal Navy that had forgotten submarines or aircraft.