ORIGINAL: RMStinson
A FACTOID:
A note of possible interest regarding the origin of the "tank" term; there is a SciFi author, Harry Turtledove, who specializes in "alternate history". His treatment of WW1 included using the term "barrels" for tanks, for the same purported reason - disguising their real intended use. If one didn't know the origin of "tank", the significance of "barrel" would have been lost on the reader.
well isn't barrel just another word for tank after all they are bothe designed to hold liquids or other loose material like grain