In a statement, Chief of Defence Staff Admiral Sir Tony Radakin said: “We expect the highest standards of behaviour from our Service Personnel and our Civil Servants.
“We investigate all allegations of inappropriate behaviour and will take robust action against anyone found to have fallen short of our standards, regardless of their seniority.”
In May, Sir Ben stepped back from the job after the investigation was launched.
It is understood that the probe looked into an alleged relationship with a female colleague.
In a statement after his sacking was announced, Sir Ben Key said: “Serving as First Sea Lord has been one of the greatest privileges of my life, and I pay tribute to the dedicated and professional officers, sailors, Royal Marines and civil servants who make up the Royal Navy.
“I deeply regret my conduct in the spring of last year, which fell well below the standard I set for myself and that which I set for the Royal Navy. As such, I fully accept the decision of the Defence Council.
“I am very sorry to those I have hurt personally, and I apologise to everyone who serves with the Royal Navy.
“Finally, I am very grateful for the support of my wife, family and friends during a very difficult time.”
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