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https://en.wikipedia.org/wiki/2003_attack_on_Karbala
Of the 29 returning Apaches, all but one suffered serious damage. On average, each Apache had 15-20 bullet holes. One Apache took 29 hits. Sixteen main rotor blades, six tail blades, six engines, and five drive shafts were damaged beyond repair. In one squadron only a single helicopter was fit to fly.