I've done a veritable metric $hit-ton of training *** - but none of it through any civilian-offered course. Militarily, especially for my job specialty, I was very gifted with my assignments and those that were in my units at the time. I was lucky, and thankful for that.
*** Metric $hit-ton of training is a measurable term and definition. It means I've spent a damn big bunch of taxpayer-funded dollars to improve my annual and quarterly ammo allocation and qualification.
I've looked into several civilian-allowed courses, as well as military courses, and there are many that I'd like to attend, but time, money and ammo are the factors. More time, than the money and ammo.