BATH (AP) — A composite deckhouse for the second Zumwalt-class destroyer has arrived at Bath Iron Works in Maine.

The deckhouse and helicopter hangar built at a shipyard in Mississippi arrived by barge on Friday. The structure will house radar and sensors, along with the bridge and combat operations center.

The 900-ton deckhouse will eventually be hoisted onto the hull of USS Michael Monsoor, the second of three of the stealthy ships that are being built at Bath Iron Works.

The Zumwalt destroyers were designed for shore bombardment and feature two 155mm guns that fire rocket-propelled warheads, along with other weapons. But it’s the ships’ unusual shape that gets them noticed. The Navy says the angular shape reduces the ships’ radar signature.