Answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. R38-class airship - The R38 class (also known as the A class) of rigid airships was designed for Britain's Royal Navy during the final months of World War I intended for long-range patrol duties over the North Sea. Four similar airships were originally ordered by the Admiralty but orders for three of these (R39 R40 and R41) were cancelled after the armistice with Germany and R.38 the lead ship of the class was sold to the United States Navy in October 1919 before completion.
Answer:
Mean Of Transportation