dereliction of duty, n.All

A Dereliction of duty (n.) once ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠saved the world: the officer who disobeyed the protocol and did not report the false warning was reprimanded.