Protective helmet system

A protective helmet system, comprising:

• a helmet having a base edge;
• a jaw piece attachable to the base edge of the helmet comprising a sealing surface, the jaw piece and a portion of the base edge of the helmet defining a user viewing window;
• a first face shield pivotable between an open position and a closed position extending across the viewing window;
• a seal configured to engage with a perimeter of the viewing window when the first face shield is in the closed position;
• and
• an attaching assembly comprising a helmet cam having first helmet cam surfaces configured to releasably attach the first face shield to the protective helmet system and second helmet cam surfaces configured to releasably attach a second face shield to the protective helmet, the attaching assembly generating a first biasing force to bias the seal toward the perimeter of the viewing window when the first face shield is in the closed position and a second biasing force to bias the first face shield away from the jaw piece when in the open position;
• and
• a second face shield releasably engaged with the second helmet cam surfaces.