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In page Boeing AH-64 Apache:
"The AH-64A then entered phase 2 of the AAH program under which three pre-production AH-64s would be built, additionally, the two YAH-64A flight prototypes and the ground test unit were upgraded to the same standard.[8] Weapons and sensor systems were integrated and tested during this time, including the laser-guided AGM-114 Hellfire missile.[10] Development of the Hellfire missile had begun in 1974, originally known by the name of Helicopter Launched, Fire and Forget Missile ('Hellfire' being a shortened acronym),[11] for the purpose of arming helicopter platforms with an effective anti-tank missile.[citation needed]
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