[yutyut]

Conventional IR countermeasures (spatial, spectral etc.) really are becoming a thing of the past.

When you’re talking about terminal IR guidance on any modern missile, generally the IRCCM will be so good that the probability of defeat with a flare cocktail is below an acceptable risk threshold. DIRCM is the current answer to this problem and—to tie this in with the parent comment—renders terminal IR guidance much less effective than MMW or other RF guidance.

https://en.m.wikipedia.org/wiki/Directional_Infrared_Counter...