– Defense News – The 2,500-person Marine Expeditionary Unit (MEU) is the basic formation of regularly-deploying US Marine Corps units, typically embarked aboard a three-ship US Navy amphibious ready group (ARG) that deploys for six months or more at a time. But the various units that make up the MEU are often called on to carry out missions hundreds of miles apart, even thousands of miles. It’s not unusual that the MEU and ARG, which together train before the deployment to operate as a single unit, split up once in theater to the point where the three ships might not even see each other for months. So does it make sense to continue that MEU/ARG construct? Gen. Robert Neller, commandant of the Corps, says yes.