Dagmar is a marine landing and breaching craft. It is able carry and deploy 200 marines onto enemy space station or ship quickly. It straps onto its target and blows a hole in its hull, allowing the marines to come through. It also has a place for mission commander to review a tactical situation and instruct his team.
The ship most like named after an actress, Dagmar, who was quite prominent in the mid-twentieth century. There is a long-standing tradition in the shipbuilding trade of fetishizing a ship with a female name or a likeness of the female form (as found on the bow or front or a ship).