Prince Harry made the shocking revelation that he killed 25 Taliban fighters during his second tour of duty in Afghanistan. In his forthcoming memoir, 'Spare', he admitted he thought of them as “chess pieces” he’d obliterated from a playing board rather than human beings, saying: "You can’t kill people if you see them as people.” Did you know these 10 other stars served in the military?

The ‘Wonder Woman’ star joined Israel's Defense Forces (IDF), where it is still compulsory to serve in the army. She taught gymnastics and martial arts, which helped her get acting roles that required physicality and toughness. She said: "You give up two or three years and it's not about you. You give away your freedom. You learn discipline and respect.”

The King of Rock and Roll was drafted into the military in 1958 as a private at Fort Chaffee. Having already become a rock star, a number of fans were there to welcome him into the army but Elvis was adamant he didn’t want to be treated any differently. Elvis was discharged in 1960 but left the army having met his wife Priscilla in Germany.

At the age of 18, the action star served in the Austrian Army in 1965. At the time, it was mandatory for all 18-year-old Austrian men to join the army. He left the camp for a week to participate in the Mr Europe bodybuilding contest. Although he won, he was punished and had to spend a few days in military prison. Schwarzenegger said: "Participating in the competition meant so much to me that I didn't think carefully about the consequences.”

BTS star Jin has recently started his mandatory military service. The 30-year-old singer - the K-pop group's oldest member - began serving on December 13 at a base close to the border with North Korea. The star - whose full name is Kim Seok-jin - shared a photo of himself over the weekend with a new buzzcut and quipped: "Ha ha ha. It's cuter than I had expected." And he later added: "It's time for a curtain call." The younger members of the band will follow him with their own enlistment in the coming years.

The Hollywood legend served in the military during the Korean War. He served as a lifeguard and swimming instructor in Fort Ord, California, during his military service. Eastwood’s longtime companion, Sondra Locke quipped: He always dropped the Korean War reference, hoping everyone would conclude that he was in combat and might be some sort of hero. Actually, he'd been a lifeguard at Fort Ord in northern California for his entire stint in the military.”

Country star Willie Nelson enlisted in the US Air Force after he graduated high school in 1950 when he was just 17. However, he was forced to cut his time in the military short, due to a longstanding back injury.

In 1944, the Playboy founder joined the US Army as an infantry employee and earned a sniper badge. Even during his time in the army, Hefner was creative and wrote cartoons for an army newsletter. After his release from the Army in 1946, he took art classes at the Chicago Art Institute before launching Playboy magazine in 1953.

The rapper served in the Army in the late-70s. It was during that time that Ice-T - whose real name is Tracy Lauren Marrow - became obsessed with hip-hop music. While stationed out in Hawaii as a squad leader at Schofield Barracks, Marrow met a pimp named Mac, who loved that he could quote the pimp-turned-writer Iceberg Slim, so he offered him pimping lessons. Ice-T went on to teach himself turntablism and rapping. As soon as he discovered that he could take an early honorable discharge because he was a single father, he was discharged in December 1979 after serving for two years and two months.

The award-winning actor turned down a partial drama scholarship to join the Air Force in 1955. He served as a radar technician for four years and left the service in 1959. Freeman said: "I liked it immediately. I served a total of three years, eight months, and 10 days, but it took me a year and a half to break free of my romantic ideas about it."

Shortly after the 9/11 attacks, the ‘Marriage Story’ star reported to the United States Marine Corps. He served two years and eight months before breaking his sternum while mountain biking just before his unit was transferred to Iraq. Driver was medically discharged with the rank of Lance Corporal. He said: "Not riding with the group of people I trained with was ... painful.”