Just realised I misunderstood this section of the post, going to delete, rewrite and repost.
They coordinate with missiles to defeat countermeasure such as flares and chaff from slow moving aircraft (helicopters etc) by observing and transmitting the position of the target from somewhat further away and transmitting that info to their missile.
Just realised I misunderstood this section of the post, going to delete, rewrite and repost.