Not sure if transport planes are weapons exactly, and at least they are also used to deliver humanitarian aid.
The difficult thing with military forces is how do you compare them? Of course they have more in total as its absolutely massive. Do you compare per person, per thing achieved?
Either way though, decarbonising more things will also bring more options as we go forward. Even if some use cases just have to be fuel you still have biodiesel as an option which becomes more practical as everything which more easily transitions does so.
If you half the overall diesel consumption you can double the amount of it made up of biodiesel without having to change biodiesel production rates at all.