The Retro-Streak Warhead was designed to confuse standard Streak missiles, preventing them from successfully engaging a target. Any 'Mech equipped with a Retro-Streak system that was attacked by a Streak launcher would fire a counter-missile salvo. The incoming Streak rounds would see the Retro-Streak salvo and follow it instead of hitting the target.
As it had absolutely no effect on other incoming missile types and took up twice the space of standard warheads, by the late 3050's most armies had canceled their Retro-Streak warhead programs in favor of the Anti-Missile System, Guardian ECM Suite and Stealth Armor systems that were effective against a multitude of weapons and sensors.
- Unbound, p. 68, "(RS) Retro-Streak Warhead "