Abstract: An Identification Friend or Foe (IFF) system uses CO.sub.2 laser identification beacons on ground vehicles such as tanks, in conjunction with an existing (or future) Forward Looking InfraRed (FLIR) detection system on an attacking aircraft or ground vehicle, to provide a cost effective solution to the problem of identifying friendly targets on a battlefield. The CO.sub.2 Laser can produce radiation only in the FLIR's spectral band, aiding stealth and improving signal to noise ratio. An acousto-optical modulator in conjunction with a specially shaped optical reflector steers the beam in the desired direction toward the FLIR in the attacking aircraft, aiding stealth and detection signal to noise ratio. The optical element also shapes the beam into the desired angular extent, needed for reception by the attacking aircraft.

Abstract: A system for protecting the cockpit of an aircraft from airborne contamination is described which comprises a generally tubular curtain of size corresponding to that of the canopy and cockpit and being pleated and collapsible along its length between an extended condition and a folded condition; a tray, attachable to and co-extensive with the canopy sill of the aircraft, the tray having a floor and inner and outer walls defining a circumferential recess for receiving the curtain in the folded condition; a lid for covering the tray with the bottom surface thereof in substantial contact with the inner and outer walls of the tray; a circumferential crimpable lip on each the floor of the tray and on the bottom surface of the lid for engaging respective ends of the curtain and providing peripheral hermetic seals between curtain and tray and between curtain and lid; inflatable circumferential seals in the sill and canopy for releasably attaching the tray to the sill and the lid to the canopy for providing hermetic