Safety helmets; Protective helmets; military helmets; Helmet mounts and mounting brackets used to attach accessories to military and civilian protective helmets; optic support for mounting optical devices in the nature of optical lens sights, optical rifle scopes, image intensifiers in the nature of magnifying lenses, and night vision rifle scopes to firearms and helmets; helmet mount units for supporting an optical vision device in the nature of binoculars, monoculars, night vision goggles, ...