Prince William is set fight in the war against drug trafficking in South America.

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The future king, a Household Cavalry officer, will join Royal Navy patrols to help catch cocaine smugglers in the Caribbean.

Both Clarence House and Armed Forces chiefs are keen for William – who will soon complete his four-month stint with the Royal Air Force – to keen as much experience as he can.

A source is quoted by the Daily Mirror as saying: “Everyone agrees he needs operational experience and to feel he is playing a vital role. As a possible future king, it is essential for everyone in the Armed Forces to see he is doing his bit.

“But there are security issues with him going to Iraq or Afghanistan as he is a massive al-Qaeda target.

“The Caribbean on a warship is an ideal tour as it has operational potential and works diplomatically. Local island governors will be very pleased to see a royal visiting them.”

William – a qualified pilot – may have to fly Navy helicopters from the drug-busting vessel as military insiders say it is “unthinkable” he would take control of a helicopter during an anti-drugs swoop.