X-21 Hammerhead Attack Helicopter

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Although it is called a Helicopter, the X-21 Hammerhead has Convertiplane capabilities, its main rotor can stop in mid-flight and attach the blades to be used as wings, transitioning to horizontal flight, in other words it takes off as a helicopter, can fly as an airplane and land as a helicopter. Being Stealth, it has internal holds and main anti-tank cannon.