Some US Navy veteran — I cannot remember the name — chided Greyhound 2020, because it's unrealistic that U boats would even attempt to torpedo a US Navy WWII destroyer.
But Retired US Navy Admiral James Foggo III did not bring up this rebuke. Foggo said WWII USN destroyers are highly manueverable and speedy. But doesn't this technical fact substantiate that veteran's criticism of unrealism?