There are vast logistics improvements to be had by replacing the old Twin Wasp radials with modern turbines.
Jet fuel is more common in airports than avgas, especially in a military context (this is why all NATO vehicles, including land vehicles, use diesel/jet fuel).
Spare engines and parts are a lot easier to find too. The PT6 turbine is still in production and widely used. The Twin Wasp radial hasn't been manufactured in decades, and I'm unsure if P&W still makes spare parts for it. There are less and less of them in existence every day.
Lastly, finding engineers with the required skills and experience to work on turbine engines is a lot easier than finding them for large radial engines.
Jet fuel is more common in airports than avgas, especially in a military context (this is why all NATO vehicles, including land vehicles, use diesel/jet fuel).
Spare engines and parts are a lot easier to find too. The PT6 turbine is still in production and widely used. The Twin Wasp radial hasn't been manufactured in decades, and I'm unsure if P&W still makes spare parts for it. There are less and less of them in existence every day.
Lastly, finding engineers with the required skills and experience to work on turbine engines is a lot easier than finding them for large radial engines.