>>64255480
The secret service has a boron carbide version of the PULV rated up to 7.62x39mm BZ API, but it has no known capability against higher-energy threats. It's alsp very restricted. There is an alll-PE ultralight version, too, but it will lose to M855 easily.
Many thin ceramics like the Hesco L211, L210, U211, etc fall apart when faced against larger calibers. Not one of those three is rated for 7.62x51 M80, the basic Level III threat. They have the ceramic strike face for steel penetrators but not enough fiberglass or PE backer for energy capture under 44mm BFD.
The less than overt "meta" is the VS-PBZSA, surpassed only by the unknown LTC plate that replaced it in 2023 as SOCOM's GEN-6 TSA/less-than-overt. This would be the direct successor to the LTC 28791.
For overt meta, the LTC 28570 is superb and could probably still be concealed under a sweater.