Duke of Cambridge becomes Aide-de-Camp to the Queen William's father the Prince of Wales is also a personal Aide-de-Camp to the monarch. The Duke of Edinburgh was made personal Aide-de-Camp by the Queen's father, King George VI. Principal ADC is an office held by some high-ranking officers in the Armed Services and includes carrying duties such as attendance on the Queen at the State Opening of Parliament or representing the Queen at memorial services. Other ADCs, rarely asked to perform any duties, are also chosen from the Armed Services. Last summer, second in line to the throne William was given the highest honour in Scotland after being installed as a Royal Knight of the Order of the Thistle at a service in Edinburgh. He is also a Knight of the Garter.