Littoral regiments as a return to Marine coastal defence

What is the logic behind the US Marine Corps’ new littoral regiments?

They resemble modernised Marine defence battalions, using anti-ship missiles and distributed littoral roles instead of older coast-defence guns.

The new formations revive an earlier Marine function. Littoral regiments replace the coast-defence guns of Second World War Marine defence battalions with anti-ship missiles and distributed modern capabilities. The structure answers current Pacific strategy and funding pressures. The Marine Corps’ culture of improvisation could let it expand or adapt again if wartime demands require larger fighting formations.