Depends. If you're talking about drilling in formation, the most safest spot is to be directly in the middle. The guy in the front is usually the vanguard who will often be crucified for messing up the movement commands, while the guy in the back legs will be visible from behind and will only be safe from most unseen eyes until the command of "To the Rear". The safest spot I would recommend is to be directly in the middle, because you'll be the least visible in case you did screwed up big time.
Remember to be the guy in the middle, it may help save your life.
