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Elvis Presley -

The King poses for a photo during his military service at a US base in Germany.

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John Coltrane -

The iconic jazz musician traded the saxophone for a a riffle in the US Navy, circa 1945.

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Salma Hayek -

The actress is pictured in a military vest and helmet during USO's "Operation Starlift" at the Hollywood Bowl in 1999.

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Prince Harry, Duke of Sussex -

Prince Harry had a military career for 10 years: from 2005 until 2015. The Duke of Sussex underwent two tours of Afghanistan.

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Marilyn Monroe -

The famous actress wears a military uniform and poses with US troops stationed in Korea on February 19, 1954.

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John Wayne -

The famous actor as Sergeant John M. Striker in the 1949 movie 'Sands of Iwo Jima.'

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Prince William, Duke of Cambridge -

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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Humphrey Bogart -

The 'Casablanca' (1942) actor is pictured in a sailor uniform while serving in the US Navy in 1919.

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Babe Ruth -

The baseball star poses for a portrait in a National Guard Uniform in Washington, D.C. on May 28, 1924.

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Charles, Prince of Wales -

Prince Charles served in the Armed Forces from 1971 to 1976, including the Royal Air Force and the Royal Navy.

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Diana, Princess of Wales -

Princess Diana is pictured with members of the  Royal Hampshire Regiment at Tidworth, Hampshire, England, on June 23, 1988.

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John Lennon -

The famous Beatle plays British soldier Gripweed in the movie 'How I Won the War' (1967).

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Goldie Hawn -

The actress got to wear a military uniform when she played Private Judy Benjamin in 'Private Benjamin' (1980).

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Marlon Brando -

Marlon Brando is pictured dressed as a Wehrmacht officer of the Third Reich, on the set of the movie 'The Young Lions' (1958).

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Queen Elizabeth II -

The then-Princess Elizabeth joined the Auxiliary Territorial Service of the British Army in 1945, during World War II, where she trained as a mechanic and learned how to drive trucks.

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Tom Selleck - The actor joined the California National Guard, serving with the 160th Infantry Regiment of the California Army from 1967 to 1973.

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Ernest Hemingway -

The American author served an ambulance unit during World War I and was wounded in the line of duty in 1918.

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Al Pacino -

The actor in a military uniform as Michael Corleone, with Marlon Brando and James Caan, on the set of 'The Godfather' (1972).

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Brigitte Bardot -

The French actress is pictured with a parachute on her back while shooting the movie 'Babette Goes to War' in 1959.

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Josephine Baker -

The American-born French entertainer in her lieutenant uniform, in Paris in October 1944.

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Kirk Douglas -

The iconic actor is pictured dressed in a military uniform, circa 1940.

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Ronald Reagan -

The then-Lieutenant Ronald Reagan at Fort Mason in San Francisco, in 1942.

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Clark Gable -

The famous actor also had a successful military career. Pictured: Captain Gable at an airfield serving as a gunnery instructor with the United States Air Force.

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Joe DiMaggio -

The baseball legend, here in uniform, as Staff Sergeant Joe DiMaggio, with his son Joseph DiMaggio.

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Lee Marvin - 'The Dirty Dozen' (1967) actor also had a real military background. He was even wounded in action and received a Purple Heart.

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Tyrone Power -

The actor poses during his military service as a pilot in the US Marine Corps, circa 1944.

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Gene Kelly -

The 'Singin' in the Rain' (1952) actor as Lieutenant (JG) Gene Kelly of the United States Naval Air Service, back in August 1945.

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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. Prince Philip was active from 1940 to 1952.

See also: The British royals' love affair with the Armed Forces

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