When Issigonis designed the Mini, he planned another vehicle to share the Mini's mechanical parts, but with a more rugged body shell. This was an attempt to take a portion of the military vehicle business from Land Rover. Issigonis had previously designed the Nuffield Guppy in a failed attempt to break into that market. By 1959, BMC had working prototypes of what was codenamed "The Buckboard", later to become the Mini Moke. These prototypes were shown to the British Army as a parachute-droppable vehicle, but poor ground clearance and a low-powered engine did not meet the most basic requirements for an off-road vehicle. Only the Royal Navy showed any interest in the Buckboard, as a vehicle for use on the decks of aircraft carriers.