In order to become an official Private in The Fallen Angels, certain demands are to be met. Private Initiates start off by training with the weapon they've been assigned to specialize with during their time as FA Initiates.
Then they start harsh physical training and basic mental training to better prepare them for the battlefield. Once this is done, they are sent into a minor conflict to test if they have the guts to be in a war and throw themselves into danger, supervised by more skilled FA Privates and an FA Sergeant.
If they don't pass, it's a repeat phase and if they pass they're promoted to official FA Privates.