Which system provides alerts and indications regarding radar threats?

The Radar Warning Receiver (RWR) is specifically designed to detect radar emissions from potential threats such as enemy radar systems or missile guidance radars. It provides critical alerts and indications to the aircrew about incoming threats that could compromise the aircraft's safety. The system analyzes the radar signals in the vicinity and informs the crew, allowing them to take necessary evasive actions or countermeasures.

This system plays a vital role in situational awareness during flight operations, particularly in hostile environments. It is important for the crew to receive timely and accurate information about radar threats, enabling them to react appropriately and enhance the aircraft's survivability.

In contrast, the other systems mentioned serve different purposes: the Infrared Counter Measure Set focuses on countering infrared threats, the Missile Warning System detects incoming missile threats, and the Ground Proximity Warning System warns of proximity to terrain. Each of these systems contributes to overall flight safety, but they do not specifically address radar threats like the RWR does.