Established in 1911 by Lt K.A.R. Sugden the OTC comprised two platoons. After the First World War the OTC continued in its role of providing basic military training in the inter-war years. Notably it mounted a guard of honour for the visit of King George V and Queen Mary to the Isle of Man in July 1920. This OTC unit later evolved into the Junior Training Corps (JTC) about a year before the beginning of the Second World War. Again in 1945 the JTC provided a guard of honour as the College welcomed King George VI and Queen Elizabeth, the first Royal guests to the College. In 1948 Field Marshal Viscount Montgomery visited the school. In that same year, the CCF was established as the JTC was integrated with the Air Training Corps (ATC) and Sea Cadet Corps (SCC) at King William's College. Membership of the CCF was compulsory for all students in their 3rd, 4th and 5th years until 2005. From 2011 students from Castle Rushen High School have been invited to join the Force. To this day the CCF provides a guard of honour on Tynwald Day.