Depends on the site, but I'd be surprised if they mandated a Dye i4 or similar. My local site is fine with mesh lower and glasses/goggles for 13-15, then a textile lower face covering is allowed for 16-17. And that's a CQB site with no bang rule.
Truth to tell, it's more honoured in the breach than in the observance.
Truth to tell, it's more honoured in the breach than in the observance.