I just want to make sure that I fully understand how the Bridge Officers work based on the Tier level of the ship. I am currently a Lt Commander on a Science Vessel. I have a Lt Science Station and an Ensign Science Station. Therefore, I have one science officer where I am able to use the first and second level skills and another science officer that is able to use only the first tier skills. When I reach the Commander level and acquire my new ship, what level are the stations? Will I ever be able to have two science officers that can use all four levels of their skills at the same time?