Commonwealth partners could help Britain in 1982 by taking over routine patrol commitments. That allowed British ships to return home for additional armament or join the forces heading south. Some assistance to a belligerent therefore took the form of maintaining an existing presence elsewhere. The example explains how allied relief could make scarce ships available for an active campaign.
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Commonwealth patrol relief during the Falklands War
Relieving routine patrol commitments let Britain prepare and concentrate ships for the South Atlantic.