This conversation has veered off a bit… there was some discussion that you now need to retake Hazardous Weather Training every 2 years, like YPT, in order to stay “current” with your training.
To be clear, being current on your training is different from earning the Den Leader, Cub Scouting or Boy Scouting Training Awards, or the similar CM/SM Keys. Those awards, once earned, are earned, and you can continue to wear the knots on your uniform (but you don’t have to), even as you move into different programs.
Also, as mentioned, the Training Awards and Keys can (and should) be earned multiple times for each program level, including as a District Volunteer. While you only wear one knot, you can add a special “device” to designate each award (but again, you don’t have to).