While the training centres gave me valuable qualifications and knowledge, on-site experience is invaluable, so I would recommend it to any newly-qualified engineer.
When I left the army, I applied for my first job as a maintenance supervisor at the local university where I spent three months. It was an enjoyable role, split between working on the tools and managing a team of different trades. I then spent a year as a Trade Supervisor, refurbishing domestic properties including new kitchens, bathrooms, rewires and general maintenance. It was both rewarding and challenging!