Harry passed the Regular Commissions Board (RCB), qualifying him to train at the Royal Military Academy Sandhurst.

Harry entered the Royal Military Academy Sandhurst, where he was known as Officer Cadet Wales and joined Alamein Company.

Harry completed his officer training and was commissioned as a Cornet (second lieutenant) in the Blues and Royals.

Harry was deployed to Afghanistan for ten weeks, serving as a forward air controller in Helmand Province.

Harry returned to Afghanistan for twenty weeks, serving with the Army Air Corps as a helicopter co-pilot and gunner.

Harry spent four weeks in April and May working with the Australian Defence Force, attached to different units in Darwin, Perth, and Sydney.

Harry resigned his short service commission, marking the end of his active military service.