Prince Harry inspects the graduating officer cadets at Sandhurst in 2017. Getty Images
Sheikh Zayed greeting his son Crown Prince of Abu Dhabi and Deputy Supreme Commander of the Armed Forces, Sheikh Mohamed bin Zayed on his graduation from Sandhurst militray academy in 1979. Alittihad
Royal Marine Cadets outside Sandhurst in 1878. Getty Images
Royal Military College Sandhurst in 1881. Getty Images
Cadets outside Sandhurst in 1881. Getty Images
Winston Churchill, on the left, as a Sandhurst cadet in 1894. Getty Images
Sandhurst cadets during a visit of King George V in 1913. Getty Images)
Cadets during physical exercises at Sandhurst College in 1925. Getty Images
Army Cadets marching out of the gymnasium and preparing for Bayonet Fencing Drill at Sandhurst College in 1938. Getty Images
Princess Elizabeth inspecting the Guard of Honor at the Royal Military College, Sandhurst, 1949. Getty Images
British Prime Minister Margaret Thatcher inspecting the Sovereign's Parade at Sandhurst in 1980. Getty Images
403692 02: Major Richard Winstanley, the Academy Adjutant, rides his horse during a rehearsal for the 138th Sovereigns Parade in 2002. Getty Images
British Prime Minister Tony Blair inspects Officer cadets after they completed their training at Sandhurst in 2003. Getty Images)
Sheikh Mohammed bin Rashid, Vice President and Ruler of Dubai, attends his son's Passing Out Parade at Sandhurst in 2006. Getty Images
Prince Harry is met by Commandant Major General Andrew Ritchie at Sandhurst Royal Military Academy. Prince Harry then began his officer training, in 2005. Getty Images
Prince Harry takes part in the Trooping Of New Colours alongside his fellow officer cadets at the Royal Military Academy, Sandhurst in 2005. Getty Images
Prince Harry in action during his training at Sandhurst Military Academy in 2006. Getty Images
Prince Charles, Prince William, Prince Harry, Prince Philip, Duke of Edinburgh, Queen Elizabeth II and Camilla, Duchess of Cornwall pose together after the passing-out Sovereign's Parade at Sandhurst in 2006. Getty Images
Prince Charles, Prince William and Prince Harry salute Queen Elizabeth II as she leaves the passing-out Sovereign's Parade at Sandhurst in 2006. Getty Images
Officer cadets from the Royal Military Academy Sandhurst change their clothes as they take a break before beginning a command task at a checkpoint as they take part in Exercise Long Reach in the Brecon Beacons in 2013. Getty Images
An officer cadet from the Royal Military Academy Sandhurst crosses a river during a command task in the Brecon Beacons in 2013. Getty Images
Graduating Sandhurst cadets march into the academy following the conclusion of the sovereigns parade at Sandhurst in 2015. Getty Images
Prince Harry inspects the graduating officer cadets at Sandhurst in 2017. Getty Images
Sheikh Zayed greeting his son Crown Prince of Abu Dhabi and Deputy Supreme Commander of the Armed Forces, Sheikh Mohamed bin Zayed on his graduation from Sandhurst militray academy in 1979. Alittihad
Royal Marine Cadets outside Sandhurst in 1878. Getty Images
Royal Military College Sandhurst in 1881. Getty Images
Cadets outside Sandhurst in 1881. Getty Images
Winston Churchill, on the left, as a Sandhurst cadet in 1894. Getty Images
Sandhurst cadets during a visit of King George V in 1913. Getty Images)
Cadets during physical exercises at Sandhurst College in 1925. Getty Images
Army Cadets marching out of the gymnasium and preparing for Bayonet Fencing Drill at Sandhurst College in 1938. Getty Images
Princess Elizabeth inspecting the Guard of Honor at the Royal Military College, Sandhurst, 1949. Getty Images
British Prime Minister Margaret Thatcher inspecting the Sovereign's Parade at Sandhurst in 1980. Getty Images
403692 02: Major Richard Winstanley, the Academy Adjutant, rides his horse during a rehearsal for the 138th Sovereigns Parade in 2002. Getty Images
British Prime Minister Tony Blair inspects Officer cadets after they completed their training at Sandhurst in 2003. Getty Images)
Sheikh Mohammed bin Rashid, Vice President and Ruler of Dubai, attends his son's Passing Out Parade at Sandhurst in 2006. Getty Images
Prince Harry is met by Commandant Major General Andrew Ritchie at Sandhurst Royal Military Academy. Prince Harry then began his officer training, in 2005. Getty Images
Prince Harry takes part in the Trooping Of New Colours alongside his fellow officer cadets at the Royal Military Academy, Sandhurst in 2005. Getty Images
Prince Harry in action during his training at Sandhurst Military Academy in 2006. Getty Images
Prince Charles, Prince William, Prince Harry, Prince Philip, Duke of Edinburgh, Queen Elizabeth II and Camilla, Duchess of Cornwall pose together after the passing-out Sovereign's Parade at Sandhurst in 2006. Getty Images
Prince Charles, Prince William and Prince Harry salute Queen Elizabeth II as she leaves the passing-out Sovereign's Parade at Sandhurst in 2006. Getty Images
Officer cadets from the Royal Military Academy Sandhurst change their clothes as they take a break before beginning a command task at a checkpoint as they take part in Exercise Long Reach in the Brecon Beacons in 2013. Getty Images
An officer cadet from the Royal Military Academy Sandhurst crosses a river during a command task in the Brecon Beacons in 2013. Getty Images
Graduating Sandhurst cadets march into the academy following the conclusion of the sovereigns parade at Sandhurst in 2015. Getty Images
Prince Harry inspects the graduating officer cadets at Sandhurst in 2017. Getty Images