The Sweet 16 of BSA Safety describe the measures we should use at all Scouting activities. The sixth point of the Sweet 16 is Personal Safety Equipment (see below).
This one goes hand in hand with the fifth point – Equipment Selection and Maintenance. Some participants in an activity might resist wearing the helmet or PFD, but it really doesn’t matter if they want to wear the equipment or not. Either they comply or they don’t participate. Surprisingly, it is not always the youth members objecting. But parents out on Scout activities need to realize that they must set the good example.
From the Sweet 16 of BSA Safety on the Scouting.org website:
6. PERSONAL SAFETY EQUIPMENT
The supervisor must ensure that every participant has and uses the appropriate personal safety equipment. For example, activity afloat requires a PFD properly worn by each participant; bikers, horseback riders, and whitewater kayakers need helmets for certain activity; skaters may need protective gear; and all need to be dressed for warmth and utility depending on the circumstances.