Looming big and awkward on the ground, a Navy airship is walked toward the portable mooring mast where a crewman waits to make it fast to the mooring swivel. Once brought snug against the mast, the blimp is able to revolve in a full 360 degree circle, or be towed into the hangar to its berth beside other non-rigids. (http://www.naval-airships.org/page-770913)