The AN/TWQ-1 Avenger is an American self-propelled surface-to-air missile system. It’s designed to provide mobile, short-range air defense protection for ground units against cruise missiles, unmanned aerial vehicles (UAVs), low-flying fixed-wing aircraft and helicopters. The system is currently used by the US Army and the US Marine Corps. (more about US mobile air defense artillery systems here)
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The AVENGER of what?
Considering that America is its own worst enemy ?