A landing craft air cushion-class hovercraft approaches Kin Blue, Okinawa, Japan, for a beach landing exercise, Oct. 27, 2015, during Blue Chromite 2016. Blue Chromite is a large-scale, cost effective on-island training event lead by 4th Marine Regiment, 3rd Marine division, III Marine Expeditionary Force. - A landing craft air cushion-class hovercraft approaches Kin Blue, Okinawa, Japan, for a beach landing exercise, Oct. 27, 2015, during Blue Chromite 2016. Blue Chromite is a large-scale, cost effective on-island training event lead by 4th Marine Regiment, 3rd Marine division, III Marine Expeditionary Force.