Britain must commit to operating both its new aircraft carriers and replacing its nuclear deterrent if it is to remain a first division military power, the head of the Royal Navy has warned.
Admiral Sir George Zambellas, the First Sea Lord, said the service faced "the fight of our generation" if it was to remain a credible force in the years ahead.
His comments were made in a speech to a closed audience of naval personnel and defence ministers.
Admiral Zambellas, who spoke out as military chiefs prepare for next year's strategic defence and security review (SDSR), said the Navy needed to retain a mix of warships, submarines, fighter jets, Royal Marine vessels and surveillance aircraft at a "sensible and credible level of scale".
He said: "Make the Royal Navy 'un-credible', and we cease to be a first division player. Our responsibility to the Navy we command and lead, to defence, and to the nation we serve, is to fight to deliver a credible Navy."
Admiral Zambellas argued the Navy needed both the new Queen Elizabeth class aircraft carriers under construction in Scotland. Under current plans, one vessel could be mothballed or sold off.
He also voiced support for a like-for-like replacement of the submarine fleet that carries the Trident nuclear deterrent, keeping the continuous-at-sea-deterrent.
"Our strategic direction will be re-defined as our nation emerges from recession. We must argue relentlessly that if we want to be a credible nation, then we need a credible Navy," he said.
A Ministry Of Defence spokesman said: "The Defence Secretary has made clear he views the nuclear deterrent as the ultimate safeguard of the UK's national security and that the Government will progress with its commitment to a like for like replacement.
"A decision on the future of the second Queen Elizabeth class aircraft carrier will be made as part of the next SDSR but the Defence Secretary has already made clear he supports the idea of it entering service with the Royal Navy."
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