In missile defense, what does CMWS detect and track during the missile's launch and sustain phases?

The correct choice indicates that CMWS, or Countermeasure/Warning System, detects and tracks UV radiation during the missile's launch and sustain phases. In missile defense systems, the CMWS is crucial for identifying and responding to missile threats.

Focusing on UV radiation, this capability is significant because the heat from a missile during its launch phase generates emissions across various spectrums. The ultraviolet spectrum can reveal specific signatures of missile launches, helping to distinguish these events from other possible sources of heat. The detection of UV radiation allows systems to monitor the launch phase effectively and assess the trajectory of the missile throughout its sustain phase.

This detection capability is vital for timely responses, as it enables defense systems to engage threats before they reach their targets. Moreover, detecting UV radiation enhances the robustness of the surveillance system, allowing for more reliable tracking under various environmental conditions.

Other options like radio frequency, visual light, and infrared heat may play roles in broader missile detection systems but are not the sole focus of CMWS specifically for tracking during the missile's launch and sustain phases. Therefore, while these forms of detection may be part of an integrated missile defense strategy, the emphasis on UV radiation in this question highlights the specific capability that distinguishes CMWS effectiveness in tracking missile threats.