Ok, in the Navy you are not facility certified unless you get qualified on all operating positions in the facility (tower, radar and flight planning).
E-3's usually are required to get GCA and flight data, ground and flight planning. E-4, E-5 fully qualified in flight planning, and then fully qualified in either tower or radar (at approach control facilities) and E-6 and above have to become fully qualified in all branches and Facility Watch Supervisors. Of course these are minimum qualifications and are adjusted for smaller facilities. Some E-3's come in and blow the whole facility away and become fully qualified and some E-6's have never been to an approach control facility or a busy tower and can't cut it and they are then told to find another job. A lot of times in the Navy we had to prioritize training time. So if we had several trainees for Local, we had to give the premium training time to the most promising trainee and that cost the junior sailor. With a 3 yr rotation we always had a multitude of trainees. For every E-3 in the Air Force to become either a local controller or an approach controller at their first duty station is pretty good, but i guess if you got assigned to radar you probably didn't have a chance to get a CTO?