The Argentine Navy possessed modern British-built Type 42 air-defence destroyers of the type forming the bulk of the British Task Force's anti-air umbrella. Training attacks on these revealed that over half of Argentine aircraft might be lost in the process of destroying only a few British warships if they attacked at the medium to high altitudes at which the Sea Dart missile was designed to engage; hence the Argentine Air Force's employment of low-level stand-off Exocet attacks in blue-water combat, and over-land approaches when in the littoral.