 The MLU introduced compatibility with night-vision goggles (NVG).The Boeing Joint Helmet Mounted Cueing System (JHMCS) is available from Block 40 onwards, for targeting based on where the pilot's head faces, unrestricted by the HUD, using high-off-boresight missiles like the AIM-9X.The F-16A/B was originally equipped with the Westinghouse AN/APG-66 fire-control radar.