This recruit had marketable, certified training, and we adjusted his training schedule to give him more time to work on other performance objectives in the field training. If the FTO had not found out about this, the trainer and trainee would have wasted their breath, time, and energy.
The numerous combat veterans returning to the workforce also possess many skills that can transfer to their training. Not everything we do is combat-zone applicable, but many experiences count. If you know that he is a veteran, ask about his military occupation specialty, training, and true life experiences that he brings to the table. This may require less in some training areas and more in others. Be open and frank in this dialogue.
Try to find out your recruits' hobbies and interests. These will often bring in training ties or common ground analogies for lectures. The classic is the softball player who is pensive with a police baton (straight or collapsible). She's not delivering a fluid transmission of energy to and through the target area. You can draw the comparison about swinging for the fence with a softball bat and tell her to swing the baton as if she were swinging through the ball.
Other interests can present a training dilemma. I had several young men with higher degrees of martial-arts belts. This intimidated the defensive tactics instructor somewhat, but we had to correct areas where they excelled. Many of the moves and countermoves they knew could not be used in police work. Yes, the "do this rather than getting injured or killed" scenario came up. For a possible legal defense, you must be able to articulate the use of the move in a police report to balance with policy.
Will you ever know all there is to know about your recruit? Probably not. Is being an FTO still a tough job? You bet. Visit the academy to talk with trainers. Spend some time at break over coffee to learn about them, and then apply what you can to make the next generation even better.