The US Navy is talking about synthesizing aircraft fuel with nuclear power and direct carbon capture on aircraft carriers.
An aircraft carrier has to slow down to take on fuel which reduces combat effectiveness (at full speed it can go a few miles while a ballistic missile in flight so it is hard to hit) they are probably paying upwards of $10/gal for fuel as it is. If synthetic fuel means they can operate independently of supplies for longer that's significant.
The Army wants to synthesize fuels too because they are paying more like $50/gal to deliver fuel to forts in places like Afghanistan. They are considering crazy ideas like molten salt reactors, O'Neill style space solar power, etc. It's a matter though of trading a vulnerable and expensive supply chain (Ukraine didn't bother trying to stop the tanks charging towards Kyiv because the fuel trucks supplying them were a soft target) for some expensive (maybe dangerous) hardware that the enemy can blow up.
Some of the aviation could be changed quite a lot if fuel savings was more weighed. For example tankers and transports could be turboprop, maybe use more smaller higher L/D drones instead of F-18:s if not absolute needed etc...
An aircraft carrier has to slow down to take on fuel which reduces combat effectiveness (at full speed it can go a few miles while a ballistic missile in flight so it is hard to hit) they are probably paying upwards of $10/gal for fuel as it is. If synthetic fuel means they can operate independently of supplies for longer that's significant.
The Army wants to synthesize fuels too because they are paying more like $50/gal to deliver fuel to forts in places like Afghanistan. They are considering crazy ideas like molten salt reactors, O'Neill style space solar power, etc. It's a matter though of trading a vulnerable and expensive supply chain (Ukraine didn't bother trying to stop the tanks charging towards Kyiv because the fuel trucks supplying them were a soft target) for some expensive (maybe dangerous) hardware that the enemy can blow up.