The Counter Rocket Artillery and Mortar system, aka C-RAM, dumps 20 mm rounds into the sky at a rate of 75 rounds per second. The C-RAM is designed to engage and destroy incoming threats such as missiles, mortars, and rockets. Based on the system used by the navy phalanx system, the C-RAM is a radar assisted Centurion multi-barrel rotary cannon. In the video below US troops conduct a live fire test with the C-RAM.