You have to go through a 2 day assessment which includes medicals, fitness and aptitude tests. Once completed you are required to attend and pass a 14 week phase 1 training package before moving on to trade training.

Easy, then take anyone who isn't on drugs. They do also employ a lot of the snowflake generation now too, as they are trying to be all inclusive. The interview was in the form of a weekend away, running around and being shouted at. You have to pass the fitness test, a medical, a short interview and some little command tasks. Oh and there's an online aptitude test.