Ballistic helmet selection for war

Want to buy a ballistic helmet, use case war so what im looking for is protection from mortar/arty/drone/ grenades frag and maybe if im lucky bullets (if theyre at the right angle, slowed down etc) while being as light and comfortable as possible, im willing to buy an expensive item but of course the less expensive the better.

Id be mounting nvgs and thermal bridge on it.

The 3 options I've been looking at are the opscore fast SF as frag protection and extremely light, the teamy Wendy exfil, same category as the fast sf just a bit heavier and also cheaper, and then the RF1 which while its rifle rating doesn't really count even you consider bfd its still got alot more protection from shrapnel at higher velocities.

Gimme ur advice tx