With the unbelievable variety of vests and helmets and personal gear that you see on both sides, a decent portion of it has got to be Chinese produced airsoft gear- I've had suspicions that at least some armor and a lot of those high-cut Ops-Core helmets you see worn by both sides are Chinese manufactured. While it's probably made to actually be used as armor and not as airsoft props, there are a lot of US tactical gear 'manufacturers' that are mostly importing and rebranding Chinese armor plates and helmets with questionable levels of protection and quality. Similar to drones, I'm sure both sides are directly contacting Chinese factories for large orders, similar to what we saw in Israel when they were initially gearing up for Gaza, and probably largely done through volunteer organizations or at the unit level.