Armor development is now getting to the point that ballistic ammunition may be obsolete UNLESS we are carrying miniature rail guns around and considering the power requirements, that may not be plausible.
Laser rifles may seem science fiction now, but if you can’t penetrate armor with bullets...
... then you use vapor deposit application of reflective metallic mirrorcoat underneath body armor and cover the battlefield with a thick fog of sugar-based room temp crystallized aerosols that disrupt cohesive light beams.
Senator: “General, in the US Army’s selection process of the XM2025 BeamCaster service weapon, did at any time the selection regimen denote trying to shoot through a layer of common attic insulation matting impregnated with dust particles of iron pyrite?”