The Spectrum Organisation, in Gerry Anderson's Captain Scarlet And The Mysterons, is an armed military force, established through a charter approved on Thursday, 7 July, 2067 and signed on Sunday, 10 July, 2067, that is tasked, in that charter, with keeping peace throughout Earth, especially between the member nations of the World Government of Earth and the political leagues whose member nations have refused to join the World Government, where the World Armed Forces--the World Army Air Force, the World Navy, the World Marine Corps, and the World Space Patrol--cannot act as effectively. It is the armed force, as a direct result, that has unfortunately found itself forced to do most of the fighting on the "front lines" of the Mysteron War.
Perhaps the primary Spectrum "academy" for training its personnel is its Koala Base, a facility located in the Outback of Australia.
The elite of Spectrum's most senior personnel are all stationed at its command headquarters; this facility is not actually located in any nation on Earth, but instead above ALL of them, aboard a flying aircraft carrier that has come to be known as Cloudbase. The identities of these elite senior personnel are protected by code names drawn from the colours of the rainbow.