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ATTACK HELICOPTERS
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HELICOPTERS
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Engineer Design Test 1, Hughes YAH-64, Advanced Attack Helicopter
Production Validation Test -- Government Kaman K747 Improved Main Rotor Blade
Engineer Design Test 2 Hughes YAH-64 Advanced Attack Helicopter
Preliminary Airworthiness Evaluation AH-1S Helicopter with OGEE Tip Shape Rotor Blades