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      I couldn't help liking Colonel Kim, although I tried not to. We sat down and he continued, "You know, it was the Vietnam war that showed how effective the Surface-to-Air Missile could be against enemy aircraft. Each SAM site had its own radar which sent out microwave signals, and looked for the return signals reflected from the metal of the aircraft, to find where the aircraft was. When the SAM site radar locked on to the aircraft it used radio control to guide the missile to the aircraft. When the missile got close enough, it tracked the aircraft by the heat from its engine for a precise hit. The missile exploded just before it reached the aircraft, so that the shrapnel carried on into the aircraft's engine which it destroyed. If the pilot did nothing, his aircraft was certain to be hit and he would need to eject - or be killed when his aircraft crashed. The SAM sites had everything built in to their own vehicle, and were easy to camouflage or move to a different location."
      Of course I knew all this, but then he told me something new. "Some of those American pilots were so silly. Each aircraft had a detector which sounded an alarm when a missile had locked on to it, and some pilots even tried turning off their engine to defeat the missile's heat seeking system. Of course you could do that with a large, slow aircraft, but not with a highly manoeuverable fighter or bomber, because it needs the engine thrust to keep it up in the air. Otherwise it will just fall out of the sky. The only way to escape a missile is to suddenly put the aircraft into a tight turn, which the missile cannot follow and so loses lock, but the pilot must be careful. If he turns too early, the missile will be able to change course enough to follow him, but if the pilot leaves his turn too late, the missile, which is traveling much faster than the aircraft - at about Mach 2.5, will catch the aircraft and explode against its side. However, a side explosion means that the aircraft will only be lightly damaged, the engine will still be safe, and the aircraft and pilot will most likely survive."