The training to be carried out at St Athan was to be specialist phase 2 and phase 3 engineering courses of the Royal Navy, Army and Royal Air Force. They include those courses delivered today within the Defence Colleges of Aeronautical Engineering, Electro-Mechanical Engineering and Communications and Information Systems. Phase 2 training involves initial trade training for the armed forces; phase 3 training involves continuous professional development. In addition, some training of overseas troops in the same disciplines was to be accommodated.