Their training can be stopped at any time, but this will undo their progress.
Training soldiers will be unavailable to go on missions. This training takes 5 days (10 on Legend). The Guerrilla Tactics School allows one Rookie at a time to train as one of the four basic classes ( Ranger, Grenadier, Specialist, or Sharpshooter) of the player's choice, up to Squaddie rank.
