The Airborne gun reference article from the English Wikipedia on 24-Apr-2004
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Airborne gun

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Airborne guns are airborne artillery pieces, designed for use by paratroopers. They are similar to infantry support guns, and are generally capable of being broken down into smaller loads (for transport by aircraft and soldiers). Airborne guns are largely outdated, their role being filled by mortarss and wire-guided missiles.

Airborne Guns Used by Various Nations

Germany