TIG Aluminum Training Request

Recently I was given an impromptu training session for the TIG welder in the Metal Shop. The class was based on steel only, using DC mode, and during the class, it was said there would need to be an additional training session for using AC mode. Is this true? Is so, are there any openings for this class coming up?

Iā€™m not sure if @malcolmputer has one going up, but to clarify its not required and you can practice AC mode etc if you do some research. The TIG trainings are often split so the instructors can focus on what the student wants to do (steer or aluminum) bit they both sign you off on the machine. Steel is easier to do for most new students as well.