I don't know the answer, but we should get rid of them. They only operate as an expensive light infantry, something the Army already does. The Air Force and Navy already have air arms, why do we need a third.
Contested amphibious operations are now deemed impossible, but the MC still requires floating tanks which cost $70M each.
And now they want this stupid thing, because they can't operate their assault ship within 40 miles of shore.
http://rt.com/usa/171936-marines-new-massive-amphibious-vehicle/