A colonel for the US Air Force who spent seven years flying the type of aircraft that crashed in Cley, north Norfolk, told the Eastern Daily Press that the HH-60G Pave Hawk may hold the US military's "best safety record".
The Pave Hawk may have the best safety record of any helicopter that the United States military has ever owned.
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The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.