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)
The AVENGER of what?
Considering that America is its own worst enemy ?