High Quality Content by WIKIPEDIA articles! The Oerlikon Millennium 35mm Naval Gun System is a Close-in weapon system designed by Oerlikon (a Rheinmetall subsidiary) for mounting on ships. It is based on the new Oerlikon 35 mm revolver cannon land based Air defense system, and uses AHEAD ammunition. A device at the muzzle end of the barrel measures the exact speed of each round as it is fired, and automatically sets the fuse to detonate the round as it approaches a pre-set distance from the target. Each round disperses 152 small projectiles to strike the incoming target. Whilst these are too small to do major damage in themselves, the accumulation of damage from multiple strikes is expected to destroy wings and control surfaces, sensors and aerodynamics, causing the target to crash. Other firing modes are designed to be effective against surface targets such as small fast attack boats.