With ground crews on the handling lines, these Navy non-rigid airships are being walked out of their vaulted hangars to go about the day's business of protecting our shores. With a roar from their engines, they will take off to patrol coastal waters and convoy merchant shipping against the menace of the submarine. One of the big naval blimps is being towed by a portable mooring mast outside the hangar doors. (http://www.naval-airships.org/page-770913)