We need very light weight torpedoes.We could go for cheaper wake homing a la soviets for these, but i doubt that would work in a closed sea like med where traffic is very heavy.
ASW rockets lack an onboard acoustic seeker; if the target moves evasively after launch, the fixed-depth explosion might miss unless the saturation area covers the error margin.
Manufacturing the Very Lightweight Torpedo | Northrop Grumman
Northrop Grumman is driving the vision for a less expensive torpedo design that's also light enough to be carried on new generations of smaller delivery platforms.