Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
Safety wants all Safety courses taken every 2 years if you go on outings that the course pertains to. However once you are trained in a position you are always trained. But note, that if you are going on outings, you must keep the Safety course up to date. That pertains to all safety courses that would be needed on the type of activity you participate in.
If it is required to be “position trained” that an ASM take Hazardous Weather training, why does that status not lapse when Hazardous Weather lapses after 2 years? And why does it not reflect in the training records as this person is no longer considered trained?
Or is it that “trained” means only that the person has taken it once in their lives and never has to take it again?