To maintain Spectrum's efficiency as Earth's leading security organisation, the organisation must regularly recruit new agents, In that optic, the Spectrum recruitment office keeps a constant monitoring of all other World Government services (World Army Air Force, Universal Secret Service, World Government Police Corps, the WASP, etc.), as well as various other fields of special interests (ingeneering, electronics, computers, medicine, piloting etc.)  and even military training academies in order to find potential candidates. Recruits come from various fields of expertise. The offer to join Spectrum only comes to those with outstanding capacities, knowledge or experience, with an emphasis to those exhibiting wide-range abilities. Only the best, the more motivated and most loyal are recruited in order to become a Spectrum agents. Training includes classes in different fields, drills to improve physical fitness, endurance and survival skills (bootcamp), training in martial arts, weapons and handing of various craft and equipment, etc. The cadets are ruthlessly drillled into efficiency, during the course of their training. 

Whatever his or her level of training, the candidate joining Spectrum must follow a mandatory training period at a Spectrum training facilities.  There are four of them, all focusing on specific fields of expertise:

• Koala Base, situated in Australia, instructing survival skills and operation of hovercraft.

• Eagle Base, attached to the W.A.A.F base at Boscombe Down, Wiltshire, England, instructing in flying training and all-terrain driving technics.

• Dolphin Base, in Indonesia, specialising in aquatic training.

• White Owl Base, in Washington State, U.S.A, focusing on Intelligence development.

A Spectrum Hovercraft, as it prepares to leave base for its scheduled patrol.

In addition to the training facilities listed above, Spectrum can also count on other World Government facilies - such as W.A.A.F. Sahara Camp - for further training, or for refreshing courses, if ever there a need for it.

Of the four Spectrum training facilities, Koala Base was the first created for the organisation. It is also the most known and the one we have the most information about, as it was featured in the TV episode 'Traitor'. It is also known that it's there that the colour-coded Captains from the higher staff followed their own training before taking their responsabilities within the organisation, as per information taken from an official source mentioning that they went to 'Australia to complete training.'

Major Stone

The information below concerns Koala Base exclusively, but it is speculated the other training facilities share some features with their Australian counterpart.

Koala Base's exact location is mostly secret, except within Spectrum itself. What the public knows about it is that it's situated somewhere in the deepest parts of the Australian outbacks, surrounded by miles and miles of desert, away from prying eyes.

It's within Koala Base that the Spectrum Hovercraft are built and tested. The craft's hangars and workshops are situation on Bloc C of the complex. As part of their test, the Hovercraft are used to patrol the rough grounds within the Base and around it. Koala Base's perimeters broadened themselves on an extensive distance - which would seem logical considering that the Training facility must dispose of a large ground to well-prepare its agents.

Koala Base's current commander is Major Stone. He overviews the whole operations for the base, the training for the cadets, and supervised construction  for the Spectrum Hovercraft. Major Stone is a loyal officer of Spectrum who helds the colour-coded officers in high regard, especially Captain Scarlet, whom he considers an heroic figure and a model to follow for his cadets.

Principal building (Bloc D)

Bloc D is Koala Base's principal building. It's where you find the  Control Room, class rooms,lecture room, communication center, archives and library.  Sleeping accomodations for officers, trainers and visitors, are also located in this building. The photo on the left shows Bloc D at night. Through the window, it is possible to glimps parts of the classrooms where the cadets receive their different courses. As seen in the episode 'Traitor'.

Control Room The domaine of Major Stone (seated), Koala Base's Control Room is evidently not as fully sophisticated as Cloudbase Control Room. It nevertheless comes with all the needed equipment (telecommunication, electronics, data computing, etc.  which makes of it a fully operating Spectrum military base. As seen in the episode 'Traitor'.

Lecture Room Koala Base's lecture room is situated in the principal building. This is where cadets officers received briefing,  theoretical instructions, or lectures from superior officers on a visit (here, Captains Blue and Scarlet). As seen in the episode 'Traitor'.

Hovercraft hangars (Bloc C) Bloc C contained the hangars where the Spectrum Hovercraft are stored as well as the workshops. It's also possibly a hangar for aircraft, considering the proximity of the runway (seen in the foreground), which is illuminated by night by the powerful lamp posts seen on the left.  On the right of the picture stands the radar house.

Runway Koala Base has its own military runway, carved into the outback desert soil.  Because the base is situated in such a remote location, the runway is in fact essential, as it is the only way to access and leave the base.  Consequently, Koala Base has at its disposal its own fleet of airplanes and helicopters, and its own team of pilots. A shuttle regularly supplies the base for food, refueling and other necessites. Craft can be taxied into hangars (possibly Bloc C) and be refueled within the premises.

Patrolling Each training facility has its own field of expertise, as part of its training courses. For Koala Base, its the maintenance, testing and handling of Spectrum Hovercraft. Every cadet must participate in the regular patrolling exercices within the base perimeters and in the surrounding area.

Koala Base badge Koala Base has its own distinctive badge. Basically, it is composed of the Spectrum emblem, surrounded by the words 'Koala Training Base'. It is worn on the uniform of all people living on the base: Officers, instructors, drills sergeants, members of personnel, pilots, cadets, etc. It could be speculated that personnels and cadets from other training facilities wear a similar badge, with their own distinctive designation.

Koala Base Uniforms Left: cadet side cap. Right:  Major Stone, with the commander uniform. The Koala Base uniform for cadets is very similar to that of the technician uniform. It is a plain charcoal uniform, with a turtleneck shirt and matching uniform. It comes with black boots with white trimming and a black belt. The Koala Base badge is embroidered on the left side of the shirt. A charcoal and white side cap (or field service cap) complete the cadet uniform. Officers and trainers also wear a similar uniform, with distinctive marks to indicate their specific status. Major Stone, commander of the base, wears epaulettes. Presumably, personnel and trainees from all Spectrum training bases around the World wears a similar outfit.

(Sources: TV Century 21 material (Annuals, books and magazines), Engale Marketing's Century 21 magazine, Issue 15, Winter 1995, Fleetway Magazines, Captain Scarlet & the Mysterons book by Chris Drake & Graham Bassett, Complete Book of Captain Scarlet by Chris Bentley… all related to TV Century 21 material.)