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Cummins awarded an $87m contract to finalise the Advanced Combat Engine (ACE), a modular and scalable opposed piston 2-stroke diesel engine solution, capable of hybridization. Doesn't sound immediately exciting, but ACE is actually pretty cool - read on to see why! 
Sitting within the Advanced Powertrain Demonstrator effort, headlines are that Cummins claims it provides a 50% increase in power density, (same power in smaller form) a 20% reduction in heat rejection, and 13% improved fuel efficiency. Add in 10x more electrical power generation
OP engines are so attractive the US Army said "The Army studied engine architectures for over 20 years and based on thousands of hours of testing independently concluded that the [OP] architecture is the superior platform on which to base the future of combat vehicle propulsion."
