They form an "intelligent swarm". All but leading missile fly at 2.5 mach speed near the surface, exchange data with each other, doing coutermeasures and manoeuvres. If the lead missile is intercepted then one of the other missiles automatically takes on the lead role.
2.5? SM2s and CIWS can get that, it would be a waste to use an ESSM or RAM on something like that.
Ah, famous American arrogance.
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