Barnaby Bear - Good summing up, some other roles involved to do with set-up of the simulators etc (depends on unit).
radarspod - It is an ATSA role, with a good mix of grades (1, 2, 3 and some 4's as well). The training is carried out "in house" and there is a validation run involved (at least there is in my unit!)
phantomlurker
