The Multi-Mission Effects Vehicle and  The Air Defense Anti-Tank System where both simular in what way? 
Multi-Mission Effects Vehicle: The Multi-Mission Effects Vehicle (MMEV) was a dual-purpose short range surface-to-air and anti-tank platform intended for use by the Canadian Forces. Air Defense Anti-Tank System: The Air Defense Anti-Tank System (ADATS) is a dual-purpose short range surface-to-air and anti-tank missile system based on the M113A2 vehicle.
dual-purpose short range surface-to-air and anti-tank