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William IV of the United Kingdom -

Also known as the "Sailor King," William IV served as a Rear-Admiral of the Royal Navy. He was active between 1780 and 1789, and served in the American War of Independence.

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Prince Henry, Duke of Gloucester -

The former Governor General of Australia attained the rank of Major in the British Army. He served in the Second World War.

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Louis Mountbatten, 1st Marquess of Milford Haven -

The Admiral of the Fleet of the Royal Navy was active from 1868 to 1914, and served in both the Anglo-Egyptian War and the First World War.

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George Mountbatten, 2nd Marquess of Milford Haven -

The Marquess of Milford Haven served in the First World War as a Royal Navy Captain. He was active from 1904 to 1937.

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Louis Mountbatten, 1st Earl Mountbatten of Burma -

Having served in both the First and Second World Wars, the late member of the royal family was promoted to Admiral of the Fleet of the Royal Navy in 1956.

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George V of the United Kingdom -

King George V (left) was a Commander of the Royal Navy between 1877 and 1891.

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George V of the United Kingdom -

He was later appointed Admiral of the Fleet of the Royal Navy, Field Marshal of the British Army, and Marshal of the Royal Air Force (RAF).

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Edward VIII of the United Kingdom -

The then-Prince of Wales started his military career in the Royal Navy. He then served as a Lieutenant of the British Army during the First World War.

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Edward VIII of the United Kingdom -

King Edward VIII then joined the Royal Air Force.

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George VI of the United Kingdom -

The then-Prince Albert started his military career very early. Here he is as a cadet at the Royal Naval College, Osborne in the Isle of Wight in 1910. 

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George VI of the United Kingdom -

King George VI went on to serve as a Lieutenant in the Royal Navy and as a Squadron Leader in the RAF. He served during the First World War.

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Prince Michael of Kent -

Active between 1963 and 1981, Prince Michael of Kent served as a Major in the British Army.

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Prince Edward, Duke of Kent -

The Duke of Kent served as Lieutenant-Colonel of the Royal Scots Greys regiment of the British Army.

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Prince Philip, Duke of Edinburgh -

The late Duke of Edinburgh served as a Commander in the Royal Navy and served in the Second World War aboard several battleships.

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Prince Philip, Duke of Edinburgh -

Prince Philip was active from 1940 to 1952 and attained the highest military ranks later in his career, including Admiral of the Fleet in the Royal Navy, Field Marshal in the British Army, and Marshal of the Royal Air Force.

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Queen Elizabeth II -

The then-Princess Elizabeth joined the Auxiliary Territorial Service of the British Army in 1945, during the Second World War.

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Queen Elizabeth II -

There, Her Majesty trained as a mechanic and even learned how to drive trucks!

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Prince Edward, Duke of Edinburgh -

Prince Edward served as Lieutenant in the Corps of the Royal Marines.

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Prince Edward, Duke of Edinburgh -

He later received numerous honorary appointments, including Royal Honorary Colonel and Commodore-in-Chief, among others.

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Alexander Windsor, Earl of Ulster -

The British Army Major was active from 1998 to 2008. He served in both the Kosovo War and the  Iraq War.

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Prince Andrew, Duke of York -

Prince Andrew served as a Commander in the Royal Navy. He was a member of the 815 Naval Air Squadron.

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Prince Andrew, Duke of York -

Active between 1980 and 2001, the Duke of York served in the Falklands War.

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King Charles III -

The then-Prince Charles served in the Armed Forces from 1971 to 1976,  including the Royal Air Force. In 1974, he qualified as a helicopter pilot.

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King Charles III -

But of course, he also followed in the footsteps of his father and his ancestors and served in the Royal Navy.

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King Charles III -

The King's current ranks include Admiral of the Fleet in the Royal Navy, Field Marshal in the British Army, and Marshal of the Royal Air Force.

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Prince William, Prince of Wales -

From 2005 to 2013, Prince William served as a Lieutenant in the Royal Navy, as a Captain in the British Army, and a Squadron Leader in the RAF.

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Prince William, Prince of Wales -

The Prince of Wales famously served as a pilot in the RAF Search and Rescue Force.

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Prince Harry -

Prince Harry had a military career for 10 years: from 2005 until 2015. The Prince achieved the rank of Captain in the Household Cavalry Regiment (Blues and Royals) of the British Army. 

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Prince Harry -

The Prince underwent two tours of Afghanistan. 

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Prince Harry -

After stepping down as a senior royal, Prince Harry was stripped of his military honorary titles.

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Prince Harry -

Prince Harry continues to support the Armed Forces. He founded the Invictus Games, an international sporting event for wounded, injured, and sick servicemen.

Sources: (The Royal Family) (British Heritage) 

See also: Royals with surprising hidden talents

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