The completed vehicle was running by the end of 1915 but by then a new design was under construction and this would become the prototype for all British heavy tanks in the First World War.

The completed vehicle was running by the end of 1915 but by then a new design was under construction and this would become the prototype for all British heavy tanks in the First World War.

So, here's how the U.S. built its first-ever tank, how it served in the Army, and where we can still see its design in tanks on today's frontlines. [Featured image by John Schaunlaub via Wikimedia ...