A U.S. Marine drives an amphibious assault vehicle onto the Watson-class vehicle cargo ship USNS Dahl during an operation to onload and offload equipment for construction of an Expeditionary Medical Facility April, 16. - A U.S. Marine drives an amphibious assault vehicle onto the Watson-class vehicle cargo ship USNS Dahl during an operation to onload and offload equipment for construction of an Expeditionary Medical Facility, April 16.