TIL During WWI a tractor company developed an experimental prototype tank for the US Army called the Skeleton Tank. It was designed to be lightweight by only having a compartment and frame that attached it to the tracks, weighing only 9 tons compared to a 29 ton British Mark V. It never saw service.

TIL During WWI a tractor company developed an experimental prototype tank for the US Army called the Skeleton Tank. It was designed to be lightweight by only having a compartment and frame that attached it to the tracks, weighing only 9 tons compared to a 29 ton British Mark V. It never saw service.