[PapaBear3625]

If I read correctly, this would allow the F-15s to see what is out there without revealing themselves by turning on their radar.

Alternately, we can send swarms of radar-equipped drones to illuminate targets for stealthy planes following behind.

[rlmorel]

True...but the point is, in a “radar-denied” environment, the reason radar is denied may be more than just protecting the individual platform that emits, it may be radar-denied to hide the existence of any presence at all.