I already have a GED, and I want to join Job Corps so I can get 675 clock hours so I can upgrade from a Tier 2 recruit in the military to a Tier 1 recruit. However, I only want to spend the least amount of time in Job Corps. Would I have to graduate and get a diploma from Job Corps in order to be considered a Tier 1, or could I just leave when I complete my 675 clock hours?