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Heat-Seeking Missile Guidance |
 | | The initial deployment of heat seeking missiles began in the late 1950's, with the USAF acquiring it's first AIM-4 Falcons and AIM-9 Sidewinders, however, it was not until the Viet-Nam war that the AIM-9 saw widespread use. |
 | | The principal heat source is the propulsion, as jet engines have an efficiency far below 100%, a considerable amount of energy is thrown away, advertising the aircraft's position. |
 | | Heat seeking missile guidance is, after more than twenty five years of use, anything but obsolete. |
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