Hydras provide the Imperial army with effective anti-aircraft capability. They are often used in conjuction with a pair of Thunderbolts to gain air superiority.
Games Workshop Models

Forge World Hydra
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Epic 40k Hydra
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Comet – Haargor Pattern AA Tank
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Novan Self-Propelled Shielder Air Defence Artillery
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Novan Regulars Self-Propelled Rocket Artillery
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Terran Federation Ballista AA Tank
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