The Opposed Piston Engine is a highly advantageous architecture for military applications due to its power density and efficiency, and the U.S. Army is investing to develop OP engines for Combat Applications. The Cummins / Achates Power team was selected to design, procure, build, test, and advance to TRL 9 the first configuration of a scalable Opposed Piston Engine that can then be used to grow a family of OP Engines across all Combat and Tactical Vehicles. At the same time CALSTART is leading a companion project to demonstrate the Opposed Piston technology in commercial Class 8 trucks. This paper analyzes the commercialization and militarization potential of Opposed Piston technology and attempts to identify the ideal OP Engine configurations to meet those applications.