LAMLS of early-warning radar station. Interior shots of radar operator, member of armed forces, watching screen and communicating by microphone. CU of lips of man speaking into microphone and of headset. LAS of military personnel in control room. Shot of four women radar operators seated at work stations. Shots of Royal Canadian Air Force officer supervising operations in control room, he talks on telephone. Night shot of CF-100 Canuck fighters parked side by side. Shot of radar operator, ECU of radar screen, CU of face of operator watching screen. MS of man sounding alert through microphone. CU of loudspeaker.