These aren't much different from the M1's engine. The AGT1500 gas turbine engine works by using an air inlet to draw in air.

For example, the HSS systems each comprised a module assembled at the Kvaerner factory incorporating turbine, combustion air intake, cooling air intake, exhaust gas exit, flexible coupling shaft ...

These types of engines lack the traditional gas turbine that helps generate ... They draw in large amounts of air through the engine inlet using the forward motion of the aircraft.