USNS Montford Point, the U.S. Navy’s first mobile landing platform, is moored against USNS Dahl, a Watson-class Large, Medium-Speed Roll-on/ Roll-off ship, during a 2015 exercise.

The Dahl is a Watson-class cargo ship crewed by contracted mariners to support U.S. military operations. It displaces more than 62 tons and has a crew of about 30, according to the Navy’s website.