NOCTURNAL Passive Defence System

The is a UNSC vehicle mounted defensive system for defeating infrared and thermal guided munitions. Though rarely used in modern combat, due to the low price and small size of the NOCTURNAL System, it is installed on the majority of ground combat vehicles. 
In the event of a infrared lock on the vehicle, it will deploy the emitters, usually placed strategically to defend the vehicle. These beams emit infrared light and are used in a 'dazzle' attack, blinding thier target. This modulating dazzle beam causes missiles to rapidly lose thier lock on and deviate from the flight path, perhaps even chase a phantom target.