“It’s like a transforming engine — literally,” explained David Tweedie, GE Edison Works general manager for advanced combat engines, of the XA100 powerplant that is now in the running to power the U.S ...

Flat engines are horizontally-opposed piston engines, and this group includes Boxer engines, but not opposed-piston engines like the Cummins 14.3L Advanced Combat Engine (ACE) designed to power tanks.

There is little doubt that the Industrial Age changed the face of warfare. In a few centuries, battle evolved from cannon and cavalry to blitzkrieg and ballistic missiles. World War I may have been ...