You can augment your ears and eyes by purchasing night vision tubes (more tubes are better, better light input area and field of view, but they ultimately need

You can augment your ears and eyes by purchasing night vision tubes (more tubes are better, better light input area and field of view, but they ultimately need to combine into two phosphor screens projecting into your eyes), a active hearing protection headset, and possibly a HUD projector to attach to the front of one of the night vision tubes. Attach all that to a high-cut helmet, and possibly a battery/compute/etc unit under your rear plate. More modern active hearing systems (3M Comtac V/Ops Core AMP/possibly others) let you set how much you want outside sounds to be amplified, and do advanced signal processing to prevent passthrough of not just loud explosive noises, but other noises that would normally prevent you from comfortably turning up the amplification as high as you might want to hear potentially relevant sounds. I guess strapping 50,000 USD worth of stuff to your body just to look like a mix between a 1990s MIT Mixed Reality Lab reject and mass shooter might be a deterrent to people actually doing this though.