Quick Kill is an active protection system (APS) designed to destroy incoming anti-tank missiles, rockets, and grenades.

Quick Kill detects incoming RPGs and anti-tank missiles with an active electronically scanned array radar.

Once its speed, trajectory, and intercept point are computed, Quick Kill vertically launches a small countermeasure missile.

It is likely that the Humvee or JLTV would not be suitable for the Quick Kill APS, due to the blast pressures generated when the incoming warhead detonates, which is likely to buckle lightly armored vehicles.

[7] There was some controversy when the United States Office of Force Transformation (OFT) planned to battle-test the more mature, but Israeli-made Trophy active protection system on several Stryker armored personnel carriers headed for Iraq in early 2007.

Jane's Defence Weekly reported on Oct 18, 2007 that the US Army had ordered design changes to the Quick Kill system after some rocket motors in an APS interceptor showed 'splittage' in recent testing that summer.