An American experimental prototype that was never produced (although a full sized, to scale version was built for The US Army Ordnance Museum), The Skeleton Tank was first envisioned in 1918). In theory, The Skeleton Tank was designed to safety and effectively navigate battlefield trenches. It's lighter design, coupled with it's innovative slender design – made The Skeleton ideal for this type of purposed mission. Weighing over 18,000 pounds, The Skeleton was 18-feet long by 8 feet wide and 10 feet high. Only designed for a crew of 2, she also only carried 1 front mounted .30 Caliber Browning Machine Gun. The Skeleton was powered by (2) 4-cylinder engines (which gave her up to 5 miles per hour on the battlefield).