Head mounted display systems primarily composed of a video signal transmitter and a display unit consisting of a mirror and lens assembly for image projection that can be viewed superimposed on a scene view; Head-up displays for use primarily in aircraft, namely, helmet mounted transparent electronic displays featuring a binocular display with an integrated head tracker for sensing motion, for use in providing crew members with navigational and operational information; Night vision goggles mounted on a helmet for displaying information superimposed on a field of view; Electro-optical targeting units and weapon targeting units, namely, night vision scopes for use mounted on firearms; Telescopes for firearms; Optical lenses, binoculars, and near eye displays comprised of projectors and optics to produce images in close proximity to the eyes of the observer; Video cameras; Cameras; Telephone sets; Electronic receivers and transmitters for telecommunication; Multiplexers; Electrical and scientific apparatus, namely, airborne, land and shipboard surveillance and reconnaissance systems comprising surveying cameras and monitors, audio and video receivers, telemeters, electronic signal transmitters and electronic audio and video monitors; Helmet mounted avionic sensor systems, namely, navigation systems; Real-time mission advisory units, namely, electronic displays for use in providing aircraft crew members with navigational and operational information; Integrated circuit modules for electronic displays for use by aircraft crew members in daylight, at night and during simulated flights; Electronic displays for use in providing aircraft crew members with navigational and operational information; Recording and debriefing units, namely, apparatus for recording, transmitting and reproducing sound and images for use by aircraft crew members to record and transmit data relating to aircraft missions