There was a precedent supporting the Europeans: American green laws insist that ships docking locally be double hulled, even though that forces ship owners to pay for unwanted double hulls on international waters en route to American ports.

ECONOMIST: Planes and pollution

The Navy now has 13 maritime prepositioned ships (MPS) divided into three squadrons, each capable of supporting a brigade-sized Marine Corps air-ground task force for 30 days.

CENTERFORSECURITYPOLICY: Introduction