This is Germany's new gun called the MANTIS (Modular Autonomic and Network Targeting and Interception System). Rheinmetall of Germany bought the Swiss company Oerlikon while developing the MANTIS (it was called the "Skyshield" under Oerlikon). The MANTIS fires 35mm bullets. These are photos from Camp Kunduz, Afghanistan.
The Phalanx CIWS (close-in weapon system) is an anti-ship missile defense gun. It's nick name is "R2-D2", for obvious reasons. It's newest form the Phalanz 1B CIWS has a rate of fire of 4,500 rounds per minute.

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