This is a very interesting topic. I wish I would have included some of these issues in my thesis about energy security. As a C-130 pilot I can tell you that using FF as a aircraft power source would be a long way off. Aircraft are not designed and built overnight. The engineering for the engine alone would pose a significant challenge. Unlimited fuel on the other hand would propose a significant carrot for certain aircraft (but not all by any means). Considering that upgrades for current aircraft can take a decade to complete I wouldn’t expect a untested power plant to be brought into service for a while. The cost of developing this power plant would be significant and may prove cost prohibitive for decades to come. However, just as the military seeks to remove people from cockpits to reduce costs, eliminating fuel costs could promote the engineering enough to provide a break through.

Some see the military exploitation of the FF reactor and are wise to investigate such risks, but the world already has the ability to end human life on the planet yet refrains from such acts as the will to live seems to over rule such actions. Focusing on how to avoid exploitation is worth wile but I wouldn’t spend as much time on this as the potential benefits.

As for the idea of stealth satellites, there are barely enough spaces in the useful orbits for what we have now. How is something that is undetectable going to be immune from the owner of the position putting something in said space? You wouldn’t want your 500 billion dollar stealth satellite turned into space junk by another commercial satellite trying to take it’s place.

There are more questions than answers at this point but they all warrant investigation and discussion.