Harry was accused of faking a knee injury to evade cadet service. In 2003, when Harry was 16 years old, he was due to start cadet training at the Royal Military Academy Sandhurst. However, he sustained a knee injury just days before he was due to start training. Harry claimed that he injured his knee playing rugby, but some cadets accused him of faking the injury in order to avoid training.
The accusations were investigated by the Royal Military Police, but no charges were ever filed. However, the accusations have dogged Harry ever since. In 2012, when Harry was serving in Afghanistan, he was photographed playing polo with a bandaged knee. This led to renewed speculation that Harry had faked his injury in 2003.
Harry has always denied faking his injury, and there is no evidence to suggest that he did. However, the accusations have undoubtedly damaged his reputation.